From john@johnmeister.com/jeep/sj Sun Mar 24 17:18:56 2002
From: john meister
as submitted to FSJ magazine March 24, 2002,
for May 2002 publication
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FULL SIZE JEEP TRANSMISSIONS:
Between 1962 until 1991 the Jeep J-series, or SJ model used 18 different
transmissions during it's production. The full listing by year, model and
engine size may be found at:
http://www.johnmeister.com/jeep/sj/FSJ/tech/Transmissions/SJ-transmissions.html
This article provides a brief summary of the types used and a few tips on
how to make the last longer.
The following is the list of all the transmissions used alphabetically:
1) Warner AS9-T14A
2) Warner T-85
3) Model T-176
4) Model T-5
5) TF 727
6) TF 999
7) TH 400
8) Warner AS5-T15A
9) Warner AS-8F
10) Warner T-15A
11) Warner T-18
12) Warner T-85
13) Warner T-86
14) Warner T-86AA
15) Warner T-86E
16) Warner T-89
17) Warner T-90
18) Warner T98A
Almost all of the transmissions used were three speeds.
The T-18, T98A and T-176 were four speeds.
The T-5 the only 5 speed used, and then only behind the 258.
The T-86E (two wheel drive only) was the only transmission, other than the
T-5, that offered an overdrive.
The Automatic transmissions used were the Warner AS-8F, TH400, TF727 and the
TF999. The two most common automatic transmissions you'll find in the FSJ
are the venerable GM TH400 and the Chrysler TF727. The TF999 was only
used from 1982 until 1986, and then only behind the 258's. The 258 was not
available after 1986 in the SJ model.
The General Motor's Turbo Hydra-Matic 3-speed torque converter automatic
transmission, aka, TH400 was first offered in 1965. It's introduction was
made in conjunction with the Kaiser 327 V8, an engine that was originally
introduced in 1956 for the Nash Ambassador Special line. The TH400 was
available until 1979.
The Chrysler TF727 became available in the 1980 model year and gained a
lockup torque converter the next year. The TF727 was used until the SJ
model line vanished from production.
The Torque Flite transmission did not, in this writer's opinion, live up to
it's earlier reputation gained in Mopar vehicles. The reason for it's
weakness in the Full Size Jeep may be related to the size and weight of the
Jeeps. It may also be related to the fact that transmission fluid is not
circulated to the transmission oil cooler when the transmission is in Park.
Any automatic transmission has a deadly foe: heat. If you can reduce the
heat of the transmission and it's fluid you will prolong it's life. Water
is another adversary; keeping water out of the transmission and it's fluid
is also important.
There are three things that I recommend doing to any automatic transmission,
and more so on a Full Size Jeep:
1) add an external transmission oil cooler (ok to leave the stock cooler
place as well)
2) use AMSOIL 100% Synthetic ATF (helps transfer heat, provides
superior protection for internal parts and clutches.)
3) add an inline oil filter assembly. I like to use a Transadapt
remote oil filter base with an AMSOIL SDF-15 (PER-1 or PH8A) filter.
The remote filter adds a quart to the total fluid, helps to cool the ATF and
filters any dirt and particles from the fluid.
The factory breather hose should be checked and made sure it's mounted as
high as possible on the firewall. The O-ring at the base of the dipstick
tube should be checked and replaced if it's leaking.
One caveat to all this cooling is that in cold weather the transmission may
not get warm enough to evaporate any moisture in it. Keeping the stock
cooler in place helps to offset this by allowing the engine coolant to heat
the ATF some. A temperature gauge mounted near the remote oil filter will
help you determine if this is an issue. Installing a couple of three way
valves in the coolant lines going to the external cooler(s) would allow you
to bypass the external cooler during cold snaps.
For manual gearboxes the use of AMSOIL Synthetic Gear Lube helps reduce
friction, making for smoother and quieter shifts. You may also see some
improvement in fuel economy. The Synthetic Gear Lube will reduce operating
temperatures and is very resistant to water contamination. The routing of
factory vent lines should be checked and placed as high as possible on the
firewall.
Any transmission, gearbox or differential will benefit from the use of
synthetic lubricants as they offer better cooling, greater protection from
corrosion, water contamination and offer longer useable life.
The following is a breakdown by year, model and engine. The full details
including gear ratios may be found at the aforementioned webpage.
SUMMARY OF TRANSMISSIONS and FSJ APPLICATION:
From the SM-1019-R2 J-Series vehicles (apx. 1963 to 1965)
MODEL Engine Speeds Transmission
J-100 std 2wd 230 3 Warner T-86
J-100 opt 2wd 230 3 - OD Warner T-86E
J-300 7600 GVW 2wd 230 3 Warner T-89
J-100,200,4000 & 5600 GVW, J-300, 5000GVW 4wd 230 3 Warner T-90
J-200, 6600 GVW, J-300 7600GVW 6600 GVW - 4wd 230 3 Warner T-89
ALL 2wd 327 3 Warner T-85
All 4wd 327 3 Warner T-85
J-100 2wd/4wd 232 3 Warner T-86AA
J-5000 GVW 2wd/4wd 232 3 Warner T-86AA
J-6000/7000 2wd 232 3 Warner T-89
J-6000/7000 4wd 232 3 Warner T-89
Gladiator 230 4 Warner T98A
Gladiator 327/232 4 Warner T-18
ALL 230 3 AT Warner AS-8F
ALL V8/232 3 AT TH 400
from the SM-1042 J-Series vehicles (apx. 1965 to 1970)
MODEL Engine Speeds Transmission
J-100 327 3 Warner T-85
Gladiator 327 3 Warner T-85
J-100 232 3 Warner AS9-T14A
Gladiator 232 3 Warner AS9-T14A
Gladiator 232 3 Warner AS5-T15A
ALL 350 3 Warner AS5-T15A
ALL 327/232 4 Warner T-18
ALL ALL 3 AT TH 400
summary for 1970, 1971, 1972, 1973, 1974, 1975
from the Standard Catalog of 4x4's by Robert C. Ackerson
6 cyl - T14A, 8 cyl - T15A, T-18 opt, TH400
1974 / 75 - Wagoneer only TH400 only
from the 1976 Factory Service Manual
(note: some models did not have all the transmission options)
MODEL Engine Speeds Transmission
ALL ALL 3 Warner T-15A
ALL ALL 4 Warner T-18
ALL ALL 3 AT TH 400
from the 1977 Factory Service Manual
(note: some models did not have all the transmission options-
Wagoneers ONLY had ATs)
MODEL Engine Speeds Transmission
Chero/J-trucks only ALL 3 Warner T-15A
Chero/J-trucks only ALL 4 Warner T-18
ALL ALL 3 AT TH 400
from the 1979 Factory Service Manual
(note: some models did not have all the transmission options-
Wagoneers ONLY had ATs)
MODEL Engine Speeds Transmission
Chero/J-trucks only ALL 3 Warner T-15A
Chero/J-trucks only ALL 4 Warner T-18
ALL ALL 3 AT TH 400
from the 1980 Factory Service Manual
(note: only the 727 was used in FSJ models,
the 999 was ONLY used in CJs)
MODEL Engine Speeds Transmission
ALL 258 4 Model T-176
ALL 360 4 Model T-176
J20 only 360 4 Warner T-18
ALL ALL 3 AT TF 727
from the 1981 Factory Service Manual
(note: only the 727 was used in FSJ models,
the 999 was ONLY used in CJs)
MODEL Engine Speeds Transmission
ALL 258 4 Model T-176
ALL 360 4 Model T-176
J20 only 360 4 Warner T-18
ALL ALL 3 AT TF 727
from the 1982/83 Factory Service Manual
(note: the 727 was used in FSJ models with V8s,
both the 727 and 999 were used with the 258)
MODEL Engine Speeds Transmission
ALL 258 4 Model T-176
ALL 360 4 Model T-176
ALL 258 5 Model T-5
J10 only 360 4 Warner T-18
Chero/Wag/J-trucks 258 3 AT TF 999
ALL ALL 3 AT TF 727
from the 1984 MR 253 Factory Service Manual
(last full manual for the SJ model)
MODEL Engine Speeds Transmission
GW/J10 258 4 Model T-176
J10 360 4 Model T-176
GW/J10 258 3 AT TF 999
GW/J10/J20 360 3 AT TF 727
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