From owner-fsj-digest-at-digest.net Sat Aug 7 21:23:51 1999 From: fsj-digest fsj-digest Saturday, August 7 1999 Volume 01 : Number 514 Forum for Discussion of Full Sized SJ Series Jeeps Brian Colucci Digest Coordinator Contents: fsj: J10 4 sale... :) fsj: Disinformation and missing info on the transfercase webpage Re: fsj: Re: Selec-Trac fsj: need a 4v carb... Re: fsj: Re: Selec-Trac Re: fsj: feasible? fsj: 76 J10, 360/T-18/dana 20 Re: fsj: Disinformation and missing info on the transfercase webpage fsj: Transmission Re: fsj: Disinformation and missing info on the transfercase webpage Re: fsj: Disinformation and missing info on the transfercase webpage FSJ Digest Home Page: http://www.digest.net/jeeps/fsj/ Send submissions to fsj-digest-at-digest.net Send administrative requests to fsj-digest-request-at-digest.net To unsubscribe, include the word unsubscribe by itself in the body of the message, unless you are sending the request from a different address than the one that appears on the list. Include the word help in a message to fsj-digest-request to get a list of other majordomo commands. ---------------------------------------------------------------------- Date: Sat, 07 Aug 1999 15:52:23 -0700 From: john Subject: fsj: J10 4 sale... :) I'm gonna pass on the 76 J10 / 360 / T-18 / Dana 20 dana 44 axles, 6 lug, good tires 31x11.5 It's in Auburn, WA. Has a new Holley carb, needs to have the timing set, but should be a good runner. Rust back end of bed/sidewalls, nice canopy. radio, manual drum brakes, power steering railroad track front bumper, bent, rear step, bent, mostly alpine white He's asking $1,000, seems like a fair price. I'm gonna check out the $2,950 80 Honcho or wait for an 81 - 84 J10 with 119" wb. email me for the guy's phone number... later, john - ----------------------------------------------------- john-at-wagoneers.com http://www.wagoneers.com ...don't leave life without Jesus, please! Snohomish, WA - where Jeeps don't rust, they mold... - ----------------------------------------------------- ------------------------------ Date: Sat, 7 Aug 1999 16:44:02 -0700 (PDT) From: Carnuck-at-webtv.net (James Blair) Subject: fsj: Disinformation and missing info on the transfercase webpage I copied and pasted the webpage, and all my comments are prefaced with A: NP208 This is a New Process box for big Jeeps that was introduced in 1980 and called Command-Trac. It's aluminum-cased and chaindriven but is a part-time setup. It was also used by GM, Ford, and Dodge, but unlike the more common GM variant, it has the front output on the left. It also has a fixed-yoke, centered rear output, unlike the slip-yoked GMs. It features a nice 2.61: low range and is seen behind automatics as well as manuals. It lasted to the end of the big Jeeps as a part-time option and was often behind six-cylinders. It's a durable unit and one of the better chaindriven transfer cases. A: Dodge also ran them on the right side, not sure about Ford. There is an aftermarket kit that gives you a 3:1 low range. Don't know who makes it, but I have 2.72 gears, 29" tires, and I go 20 mph in low flat to the boards, and pull a 3 ton trailer loaded. It interchanges with the Jeep NP219, NP228, and NP229 full-time transfer cases. Chain wear isn't a problem, because the chain is only in operation when the unit is used in four-wheel drive. A: The chains do wear out and break the cases on occaision. They are not built to operate on dry pavement, or any good traction surface. The NP208 has only 1 shift lever, and usually comes with locking hubs (the only NP series in the full size that does) The length is shorter than the others, so a longer driveshaft is needed to swap a NP208 in place of the others. The NP208 is the only one available behind standard trannies in full size from '80 to '87 (last year for standard tranny in a full size) The shift pattern on the NP208 behind a standard is reverse to the automatic one. (FWIW, big block Chev's came with a RH drive NP209 that is super duty, and wanted by all the 4x4 racers, and is worth about $1500 for a working core) NP219 Built by New Process Gear, this was the second incarnation of the Quadra-Trac used in the big Jeeps from 1980-1982. It is basically a full-time version of the NP208 and is also an aluminum, chaindriven piece with a 2.61:1 low range. It interchanges with the Jeep NP208, NP228, and NP229 full-time transfer cases. Because it's a full-time unit, chain wear is a problem. These transfer cases are hard to find, so the best we could do was show you an exploded view from the '80 Jeep manual. A: My NP219 had a 3 position shifter. Hi, neutral and low. No 2 wheel drive was possible like the 208 or others. If you disconnect either driveshaft, the viscous clutch would fry very quickly, which is why they weren't popular. There is a way to make it 2 wheel drive through some dismantling, but it was for emergency use only. It was never available behind a std tranny. There are 2 input splines to watch out for as well. Either 21 or 23 (I saw both when I did the 727 trannies) but only 23 spline after late '82. NP228 Very similar to the NP219 and NP229, it's minus the 2WD/4WD Selec-Trac feature of the NP229. A: My '86 NP228 (only year available) is the exact same as the NP229, but it has no viscous clutch in 4 hi, but both have lo lock. It was only factory available in '86. I took the one I had, and used the viscous clutch from my AMC Eagle NP129 to make it into a NP229. (Wish I took pics while Sea-Tac trans did it. I'll be doing a NP229 soon though). This full-time case uses a 2.61:1 low range and was optional from 1985-1991 in big Jeeps. Though nothing special, it interchanges with the Jeep NP208, NP219, and NP229 full-time transfer cases. Chain wear can be a problem because of the full-time operation. NP229 This New Process 'case was introduced as an option in the big Jeeps in 1983 as the Selec-Trac and had unique features for the time. Like the others in this family, it has an aluminum case, a chaindrive, and a 2.61:1 low range. The NP229 is essentially a full-time case with a center diff that can be locked, but it also has a 2WD mode. This 2WD mode helps fuel economy, but the owners manual (and who reads the owners manual?) said to periodically run it in full-time mode to fully lubricate the unit. Since many folks didn't do that, the transfer cases often failed after a few years and got the reputation of being unreliable This unit lasted through 1986. It interchanges with Jeep NP208 and NP219 and NP228 full-time transfer cases. Chain wear can be a problem when these units are used in full-time operation. A: The '80 to '85 full size Jeeps with NP 229 came with vacuum shift front axles. They were only available with automatic transmissions. NP207 A lightweight, light-duty New Process chaindrive, part-time case that was introduced in '84 for midsize Cherokee/Comanche XJ models. It was also used in 1987 in Wrangler model YJ. Essentially, it's an early version of the NP-231 that replaced it in 1988 in XJs and YJs. It has a nice 2.72:1 low range and will interchange with the later NP231, but two input splines were used: 21 and 23. Shown is the NP207 C, which is the Chevrolet S-10 version but is very similar externally to the Jeep J version. NV247 The latest unit for the '99 Grand Cherokee WJ. It's related to the other full-time New Venture chaindrive transfer cases but features the new Gerotor pump in place of a center differential. This slick unit almost instantly senses slippage and then locks. This is a full-time case that may be the most transparent of any yet designed. It's shown here in a '99 WJ. A: What about the NV249? It came behind the magnum motor in '91 and up Jeep Grand Cherokees. Similar to the NV231, but heavier chain and gears. (I have one for parts that was broken in a rollover accident) It will fit in place of the NP229, but it has a slip yoke on the rear shaft. NP242 This is a full-time case that was introduced in 1987 for the XJ models as Selec-Trac. It's also used on the Grand Cherokee ZJ models as the baseline transfer case for six-cylinders. It features a lockable center differential and a 2.72:1 low range. Shown is a late-model 242 in a '96 Grand Cherokee. Jim Blair, Seattle WA 1983 Cherokee 4 dr 4.2L six, 999 AT, Manual hubs Homepage: http://homepages.go.com/~carnuck/carnuck.html FREE Online Photo Album: http://albums.photopoint.com/j/AlbumList?u=13998&Auth=false ------------------------------ Date: Sat, 7 Aug 1999 17:01:30 -0700 (PDT) From: Carnuck-at-webtv.net (James Blair) Subject: Re: fsj: Re: Selec-Trac A: As long as you don't have the vacuum shift front axle, or modify the axle so it stays engaged, you can shift on the fly. I have a 229 on my '89 GW. Here's the straight scoop: It is a full time / part time 'case. You can run on hard surfaces all you want in either 2WD or 4WD high. It is locked in 4WD Low, and should only be used on surfaces with some "give". I have heard that driving in 4WD lock (low, in the case of the 229) can damage the drive train, but I have never seen it happen. It will certainly wear out a whole lot quicker because of the extra stress. The differential in the 'case has a viscous coupler wrapped around it. This offers some limited slip. The more speed difference there is between the axles, the more torque will be transferred to the axle with good traction. This heats up the coupler, however. If you ever lose a driveshaft, don't even think of driving it in 4WD high. If you lose the rear driveshaft and are really desperate, you can drive it in 4WD low. Your top speed will be severely limited, however. Your engine will be running way too fast, too. When you're in 2WD high, the entire drivetrain will be moving. This includes the drive chain. The drive chain will not be transmitting much torque, however. That is why they rarely wear out in a PT/FT 'case. I generally drive around in rear wheel drive, but I'll switch to 4WD if the road is wet (sometimes) and during the snowy parts of the winter. The older GWs with the 229 had a front axle disconnect - a feeble attempt at better mileage. With this system you had to stop the Jeep to switch to 4WD. With the newer "shift on the fly" system, it's just a matter of flipping the switch. BTW, I have switched between 4WD and 2WD at speeds of up to 80 MPH with no problems. Ray Drouillard '89 Grand Wagoneer On Wed, 28 Jul 1999 09:26:42 -0700 (PDT) john writes: On Wed, 28 Jul 1999, Berry, Bradley A wrote: OK John, please explain these to me. 1) My 88 GW has a 229 transfer case, which, the last time I checked was a Selec-Trac unit. My understanding of this unit has been that it is a part time 4WD unit which should only be used off road or under snow/wet conditions on paved roads which will allow slippage of the wheels. I've assumed that this means that the transfer case doesn't have a clutch pack in it which allows the front and rear axles to turn at different rates, so that if I drove the truck in circles long enough, I would break the chain due to the stresses on it. ok, first off, it's not a "part-time" unit, it's a full-time unit that has 2wd mode. You CAN drive on hardsurfaces with this. From my feeble memory I believe this is a differentiated unit. It does NOT have 4wd high lock up capablity, where the NP219 does. You will NOT hurt this unit running in 4wd all the time. I bought the service manual a year ago, and it basically backed this up, but I never had an owners manual because I was waiting for the previous owner to send it to me. I finally broke down and bought the OM, and its' story about the transfer case is a little different. It says: =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0HI Position =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A02WD or 4WD - In either position, the vehicle may be operated on all road surfaces. In 4WD, Selec-Trac offers better traction =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0when roads are wet, snow covered, or icy. Use Selec-Trac 4WD year-round (full time) if you wish. yep. 4wd low is a no-no except in really slick stuff though, it does "lock" up. :) This seems pretty clear, but it doesn't seem to match up to my service manual, which says to use 2WD HI on hard surface roads, and 4WD HI on snow, mud, sand, or off-road. sounds like standard rheotaric (sp?) for a part time unit. :) OK Knower of all things Jeep, what's the scoop? another example of errors in jeep documentation... no problem... :) 2) When can I go in and out of 4WD? My service manual says that I should stop the vehicle, pull out a switch lever release pin (which doesn't exist on my vehicle), and then switch to 4WD. The Owners manual says that "mode selection can be made while the vehicle is moving at any legal speed." (Even in Montana?) OK, which is it? I'd say look at the web page somewhere on my site that covers the NP229... it's out there... somewhere... :) I'd recommend doing it at slower speeds, as based on my experiences with the NP229. They are consistent about shifting the transfer case at least. They both call for being in neutral, rolling at 2-3 mph, although I'm not sure that I could count on the jeep rolling long enough for me to shift the case at that speed. 3) The other half of the reason I bought this manual, was so that I could find out what I could reasonably load onto the roof rack. The tremendously helpful manual states: "A roof-top luggage rack is available for the Grand Wagoneer model. A wrench for the adjustable crossbows is stored in the glove box." Well it lied on the second part, and I just want to know if I can load a 75 lb canoe on this rack, or if I should buy a separate roof rack. Any opinions? I've carried as much or more on mine... it's ok, but the rack is held on by wellnuts... For extended or prolonged use a gutter mount rack would be better... john Thanks, Brad Berry Jim Blair, Seattle WA 1983 Cherokee 4 dr 4.2L six, 999 AT, Manual hubs Homepage: http://homepages.go.com/~carnuck/carnuck.html FREE Online Photo Album: http://albums.photopoint.com/j/AlbumList?u=3D13998&Auth=3Dfal= se ------------------------------ Date: Sat, 07 Aug 1999 17:17:32 -0700 From: john Subject: fsj: need a 4v carb... Someone offered me a good, as in working, 4v carb for a 77 (or near) a while back... If you still have it email me off list. My search for an adapter to mate my Edelbrock 1406 to this 77 stock 4v manifold has met it's end... I've tried two different adapters and flipped through every page of the Edelbrock catalog... That leaves me two options: 1) get a performer manifold or 2) get a stock carb correction, three options: or 3) rebuild existing stock carb I think I'm gonna keep this 77 Wagoneer stock and nice so I can sell it for top $$ so I can buy that 80 Honcho I've located... I guess I'll keep my 1406 for the 80 Honcho, they are really nice carbs... smoootthhh... :) let me know... might be able to do some horse tradin'... john - ----------------------------------------------------- john-at-wagoneers.com http://www.wagoneers.com ...don't leave life without Jesus, please! Snohomish, WA - where Jeeps don't rust, they mold... - ----------------------------------------------------- ------------------------------ Date: Sat, 07 Aug 1999 17:24:53 -0700 From: john Subject: Re: fsj: Re: Selec-Trac At 05:01 PM 8/7/99 -0700, James Blair wrote: >A: As long as you don't have the vacuum shift front axle, or modify the >axle so it stays engaged, you can shift on the fly. That's not true, I've had several of the vacuum shift front axles with NP207's and NP229's, could shift on the fly at any speed I wanted... Only broke one fork once... I was pulling a J-turn in the snow and engaged 4wd just as I hit the curb with wheels at full lock and full power... :( john - ----------------------------------------------------- john-at-wagoneers.com http://www.wagoneers.com ...don't leave life without Jesus, please! Snohomish, WA - where Jeeps don't rust, they mold... - ----------------------------------------------------- ------------------------------ Date: Sat, 07 Aug 1999 17:23:07 -0700 From: john Subject: Re: fsj: feasible? At 02:24 PM 8/7/99 -0400, Raymond C Drouillard wrote: >OK John... sit down, relax, and repeat after me: I'm sitting down... :) >"There is no reason to carve something into something else that already >exists, anyway" ok... makes sense... >If you want a pick'em'up truck, go get a J10 or something. They already >exist. You don't have to spend hundreds of hours carving that poor waggy >into something that resembles what rolled off the assembly line by the >thousands. the numbers declined in the later years for the short J10's... :( after 84 they ceased to exist... only the 131's were left... :( >Spend that hundreds of hours doing that eunich programming stuff and take >a fraction of the money and use it to buy a pick'em'up truck. I'm salaried... :( and it's UNIX. :) >Now that you have your J10, and some cash left over from all that eunich >programming or book writing, you can start working on things that HAVEN'T >been built before. should get my book going shouldn't I? :) >Then, get yourself a Cummins or Ford Powerstroke mounted to the same >transmission and t-case that it came with. Cram all of that under the >hood with an air conditioner (for those three days a year when the temp >goes over 65). Install some extra heavy duty weatherstripping and it's usually at least 6 days... :) >windshield wipers. Rip out the carpet and replace it with Rhino Liner >(won't mold). You might even want to rhino-line the bottom of the body. >I know you empty-nesters like your quiet rides. nest ain't empty yet... both of the little birdies are hear and eating more than ever... ;) it'll be at least another year or two before the biggest of the youngin's flys out... the baby bird will be here for at least another couple years... he's gonna be a Jr. in HS this year... >To top it off, you can add a snorkel so you won't have to move when >everything west of the Rockies falls into the Pacific. at the current rate of rainfall I'd better equip all my rigs with said snorkel... This is OUR DRY SEASON and it's pouring outside... it's ridiculous! john - ----------------------------------------------------- john-at-wagoneers.com http://www.wagoneers.com ...don't leave life without Jesus, please! Snohomish, WA - where Jeeps don't rust, they mold... - ----------------------------------------------------- ------------------------------ Date: Sat, 07 Aug 1999 17:41:46 -0700 From: john Subject: fsj: 76 J10, 360/T-18/dana 20 Here's the phone number: 253.804.0175 ask for Jim he wants $1,000 for his J10. I don't think he's out of line on the price. Decent tires, body pretty straight, good canopy, engine/trans look pretty clean - can tell it's all normal, not detailed or anything like that. It has manual drum brakes, power steering. Brand new Holley 4v. Alpine White, Interior Blue, Warn hubs. Needs some tlc, timing set, otherwise pretty good... ;) ttyl, john - ----------------------------------------------------- john-at-wagoneers.com http://www.wagoneers.com ...don't leave life without Jesus, please! Snohomish, WA - where Jeeps don't rust, they mold... - ----------------------------------------------------- ------------------------------ Date: Sat, 7 Aug 1999 23:43:06 -0400 From: Raymond C Drouillard Subject: Re: fsj: Disinformation and missing info on the transfercase webpage >NV247 >The latest unit for the '99 Grand Cherokee WJ. It's related to the other >full-time New Venture chaindrive transfer cases but features the new >Gerotor pump in place of a center differential. This slick unit almost >instantly senses slippage and then locks. This is a full-time case that >may be the most transparent of any yet designed. It's shown here in a >'99 WJ. > >A: What about the NV249? It came behind the magnum motor in '91 and up >Jeep Grand Cherokees. Similar to the NV231, but heavier chain and gears. >(I have one for parts that was broken in a rollover accident) It will >fit in place of the NP229, but it has a slip yoke on the rear shaft. Was the NV231 ever put behind a 4l six-banger? If so, would it be possible to transplant the transmission from a GC with a 4l engine and an NV231 t-case? Ray ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj. ------------------------------ Date: Sat, 7 Aug 1999 23:54:59 -0400 From: Raymond C Drouillard Subject: fsj: Transmission OK... my two previous messages alluded to the fact that I want to upgrade my transmission. I need a transmission that I can put between my AMC 360 V8 and NP229 transfer case. I would prefer to use no adapters, but I'll go with an engine to transmission adapter if necessary. I want a five speed manual or a four speed automatic (overdrive). Is there a version of the TH 700 R4 or 4L60E or 5L80E that'll work? Is there a 5-speed transmission that will work? How about a 5-speed from a wrecked XJ with command track? My TF727 is dying a slow and painful death. If I have to deal with it, I would rather get a more efficient transmission with a lower first gear (My GW is a pig off the line - unless I'm in low range). It would be absolutely awesome with a 5-speed manual :) Ray Drouillard ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj. ------------------------------ Date: Sat, 7 Aug 1999 23:37:54 -0400 From: Raymond C Drouillard Subject: Re: fsj: Disinformation and missing info on the transfercase webpage >NP229 >This New Process 'case was introduced as an option in the big Jeeps in >1983 as the Selec-Trac and had unique features for the time. Like the >others in this family, it has an aluminum case, a chaindrive, and a >2.61:1 low range. The NP229 is essentially a full-time case with a >center diff that can be locked, but it also has a 2WD mode. This 2WD >mode helps fuel economy, but the owners manual (and who reads the owners >manual?) said to periodically run it in full-time mode to fully >lubricate the unit. Since many folks didn't do that, the transfer cases >often failed after a few years and got the reputation of being >unreliable This unit lasted through 1986. It interchanges with Jeep >NP208 and NP219 and NP228 full-time transfer cases. Chain wear can be a >problem when these units are used in full-time operation. > >A: The '80 to '85 full size Jeeps with NP 229 came with vacuum shift >front axles. They were only available with automatic transmissions. The NP 229 was used all the way to the end of the FSJs. I have one in my '89 GW. Also, lubrication is not a problem with the units that don't have front axle disconnects (the shift-on-the-fly units). Everything in the whole drivetrain is turning all the time whether you are in 2WD or 4WD. My unit has about 130,000 miles on it and is giving me no trouble at all - - which is more than I can say for my TF727. BTW, what else can I put in front of my t-case (w/o AA)? I want a 5-speed manual or a 4-speed automatic. Ray ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj. ------------------------------ Date: Sat, 7 Aug 1999 20:38:32 -0700 (PDT) From: Brian Subject: Re: fsj: Disinformation and missing info on the transfercase webpage YOU GO, BOYYYYYYY!! - --- James Blair wrote: > I copied and pasted the webpage, and all my comments > are prefaced with > A: > > NP208 > This is a New Process box for big Jeeps that was > introduced in 1980 and > called Command-Trac. It's aluminum-cased and > chaindriven but is a > part-time setup. It was also used by GM, Ford, and > Dodge, but unlike the > more common GM variant, it has the front output on > the left. It also has > a fixed-yoke, centered rear output, unlike the > slip-yoked GMs. It > features a nice 2.61: low range and is seen behind > automatics as well as > manuals. It lasted to the end of the big Jeeps as a > part-time option and > was often behind six-cylinders. It's a durable unit > and one of the > better chaindriven transfer cases. > > A: Dodge also ran them on the right side, not sure > about Ford. There is > an aftermarket kit that gives you a 3:1 low range. > Don't know who makes > it, but I have 2.72 gears, 29" tires, and I go 20 > mph in low flat to the > boards, and pull a 3 ton trailer loaded. > > It interchanges with the Jeep NP219, NP228, and > NP229 full-time transfer > cases. Chain wear isn't a problem, because the chain > is only in > operation when the unit is used in four-wheel drive. > > > A: The chains do wear out and break the cases on > occaision. They are not > built to operate on dry pavement, or any good > traction surface. The > NP208 has only 1 shift lever, and usually comes with > locking hubs (the > only NP series in the full size that does) The > length is shorter than > the others, so a longer driveshaft is needed to swap > a NP208 in place of > the others. The NP208 is the only one available > behind standard trannies > in full size from '80 to '87 (last year for standard > tranny in a full > size) The shift pattern on the NP208 behind a > standard is reverse to the > automatic one. (FWIW, big block Chev's came with a > RH drive NP209 that > is super duty, and wanted by all the 4x4 racers, and > is worth about > $1500 for a working core) > > NP219 > Built by New Process Gear, this was the second > incarnation of the > Quadra-Trac used in the big Jeeps from 1980-1982. It > is basically a > full-time version of the NP208 and is also an > aluminum, chaindriven > piece with a 2.61:1 low range. It interchanges with > the Jeep NP208, > NP228, and NP229 full-time transfer cases. Because > it's a full-time > unit, chain wear is a problem. These transfer cases > are hard to find, so > the best we could do was show you an exploded view > from the '80 Jeep > manual. > > A: My NP219 had a 3 position shifter. Hi, neutral > and low. No 2 wheel > drive was possible like the 208 or others. If you > disconnect either > driveshaft, the viscous clutch would fry very > quickly, which is why they > weren't popular. There is a way to make it 2 wheel > drive through some > dismantling, but it was for emergency use only. It > was never available > behind a std tranny. There are 2 input splines to > watch out for as well. > Either 21 or 23 (I saw both when I did the 727 > trannies) but only 23 > spline after late '82. > > NP228 > Very similar to the NP219 and NP229, it's minus the > 2WD/4WD Selec-Trac > feature of the NP229. > > A: My '86 NP228 (only year available) is the exact > same as the NP229, > but it has no viscous clutch in 4 hi, but both have > lo lock. It was only > factory available in '86. I took the one I had, and > used the viscous > clutch from my AMC Eagle NP129 to make it into a > NP229. (Wish I took > pics while Sea-Tac trans did it. I'll be doing a > NP229 soon though). > > This full-time case uses a 2.61:1 low range and was > optional from > 1985-1991 in big Jeeps. Though nothing special, it > interchanges with the > Jeep NP208, NP219, and NP229 full-time transfer > cases. Chain wear can be > a problem because of the full-time operation. > > NP229 > This New Process 'case was introduced as an option > in the big Jeeps in > 1983 as the Selec-Trac and had unique features for > the time. Like the > others in this family, it has an aluminum case, a > chaindrive, and a > 2.61:1 low range. The NP229 is essentially a > full-time case with a > center diff that can be locked, but it also has a > 2WD mode. This 2WD > mode helps fuel economy, but the owners manual (and > who reads the owners > manual?) said to periodically run it in full-time > mode to fully > lubricate the unit. Since many folks didn't do that, > the transfer cases > often failed after a few years and got the > reputation of being > unreliable This unit lasted through 1986. It > interchanges with Jeep > NP208 and NP219 and NP228 full-time transfer cases. > Chain wear can be a > problem when these units are used in full-time > operation. > > A: The '80 to '85 full size Jeeps with NP 229 came > with vacuum shift > front axles. They were only available with automatic > transmissions. > > NP207 > A lightweight, light-duty New Process chaindrive, > part-time case that > was introduced in '84 for midsize Cherokee/Comanche > XJ models. It was > also used in 1987 in Wrangler model YJ. Essentially, > it's an early > version of the > NP-231 that replaced it in 1988 in XJs and YJs. It > has a nice 2.72:1 low > range and will interchange with the later NP231, but > two input splines > were used: 21 and 23. Shown is the NP207 C, which is > the Chevrolet S-10 > version but is very similar externally to the Jeep J > version. > > NV247 > The latest unit for the '99 Grand Cherokee WJ. It's > related to the other > full-time New Venture chaindrive transfer cases but > features the new > Gerotor pump in place of a center differential. This > slick unit almost > instantly senses slippage and then locks. This is a > full-time case that > may be the most transparent of any yet designed. > It's shown here in a > '99 WJ. > > A: What about the NV249? It came behind the magnum > motor in '91 and up > Jeep Grand Cherokees. Similar to the NV231, but > heavier chain and gears. > (I have one for parts that was broken in a rollover > accident) It will > fit in place of the NP229, but it has a slip yoke on > the rear shaft. > > NP242 > This is a full-time case that was introduced in 1987 > for the XJ models > as Selec-Trac. It's also used on the Grand Cherokee > ZJ models as the > baseline transfer case for six-cylinders. It > features a lockable center > differential and a 2.72:1 low range. Shown is a > late-model 242 in a '96 > Grand Cherokee. > > Jim Blair, Seattle WA 1983 Cherokee 4 dr 4.2L six, > 999 AT, Manual hubs > Homepage: > http://homepages.go.com/~carnuck/carnuck.html FREE > Online > Photo Album: > http://albums.photopoint.com/j/AlbumList?u=13998&Auth=false > > > > === Brian ( http://go.to/graywolf ) 78 J-10 4bbl/360/TH400/PTQT/D44/D44 97 Thunderbird 4.6 V8 I won't insult your intelligence by suggesting that you really believe what you just said -William Buckley, Jr. The word bipartisan usually means some larger-than-usual deception is being carried out. -George Carlin _____________________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com ------------------------------ End of fsj-digest V1 #514 *************************