FSJ's are Jeep Cherokees and Jeep Wagoneers made from 1962 to 1992.  
They include Grand Wagoneers, Gladiators, J10's through J4000's and any other
J-series trucks.  (Also welcome are Jeepsters, Willys Trucks and Willys Wagons.)


FSJ Gearing
	
	speed = (rpm * dia * pi * 60) / (gears *12 *5280)
		speed = (rpm * dia * 188.496) / (gears * 63360) 

	
	gears = (rpm * dia * pi * 60) / (speed *12 *5280)
	
	rpm = (speed * gears * 12 * 5280) / (dia * pi * 60)


typical axle ratios and speeds -  http://johnmeister.com/jeep/sj

	
	FSJ Gearing -  3.54 gears
	
	speed = (rpm * dia * pi * 60) / (gears *12 *5280)



 
P235

30x9.5
31x10.5
35x12.5
35x12.5


Gears:
3.54
3.54
3.54

3.54
4.88


Tires:
28.88
29.30
30.80
34.00
34.00



tach
mph
mph
mph
mph
mph


600

14.56
14.77
15.53
17.14
12.44


700
16.99
17.24

18.12
20.00
14.51


800
19.42
19.70
20.71
22.86

16.58


900
21.84
22.16
23.30
25.72
18.65



1000
24.27
24.62
25.88
28.57
20.73


1100

26.70
27.09
28.47
31.43
22.80


1200
29.12
29.55

31.06
34.29
24.87


1300
31.55
32.01
33.65
37.15

26.95


1400
33.98
34.47
36.24
40.00
29.02



1500
36.41
36.94
38.83
42.86
31.09


1600

38.83
39.40
41.41
45.72
33.16


1700
41.26
41.86

44.00
48.57
35.24


1750
42.47
43.09
45.30
50.00

36.27


1850
44.90
45.55
47.89
52.86
38.35



1950
47.33
48.02
50.47
55.72
40.42


2050

49.75
50.48
53.06
58.58
42.49


2150
52.18
52.94

55.65
61.43
44.56


2250
54.61
55.40
58.24
64.29

46.64


2350
57.04
57.87
60.83
67.15
48.71



2450
59.46
60.33
63.42
70.00
50.78


2550

61.89
62.79
66.00
72.86
52.85


2650
64.32
65.25

68.59
75.72
54.93


2750
66.74
67.71
71.18
78.58

57.00


2850
69.17
70.18
73.77
81.43
59.07



2950
71.60
72.64
76.36
84.29
61.15


3050

74.03
75.10
78.95
87.15
63.22


3150
76.45
77.56

81.53
90.01
65.29


3250
78.88
80.03
84.12
92.86

67.36


3350
81.31
82.49
86.71
95.72
69.44



3450
83.73
84.95
89.30
98.58
71.51


3550

86.16
87.41
91.89
101.44
73.58


3650
88.59
89.88

94.48
104.29
75.66


3750
91.01
92.34
97.07
107.15

77.73


3850
93.44
94.80
99.65
110.01
79.80



3950
95.87
97.26
102.24
112.86
81.87


4050

98.30
99.73
104.83
115.72
83.95


4150
100.72
102.19

107.42
118.58
86.02


4250
103.15
104.65
110.01
121.44

88.09


4350
105.58
107.11
112.60
124.29
90.16



4450
108.00
109.57
115.18
127.15
92.24


4550

110.43
112.04
117.77
130.01
94.31


4650
112.86
114.50

120.36
132.87
96.38


4750
115.29
116.96
122.95
135.72

98.46


4850
117.71
119.42
125.54
138.58
100.53



4950
120.14
121.89
128.13
141.44
102.60


5050

122.57
124.35
130.71
144.30
104.67





	
	FSJ Gearing -  3.31 gears

	
	speed = (rpm * dia * pi * 60) / (gears *12 *5280)



 
P235
30x9.5
31x10.5
35x12.5
35x12.5



Gears:
3.31
3.31
3.31
3.31
4.88


Tires:

28.88
29.30
30.80
34.00
34.00


tach
mph
mph

mph
mph
mph


600
15.57
15.80
16.61
18.34

12.44


700
18.17
18.43
19.38
21.39
14.51



800
20.77
21.07
22.15
24.45
16.58


900

23.36
23.70
24.91
27.50
18.65


1000
25.96
26.33

27.68
30.56
20.73


1100
28.55
28.97
30.45
33.61

22.80


1200
31.15
31.60
33.22
36.67
24.87



1300
33.74
34.23
35.99
39.73
26.95


1400

36.34
36.87
38.76
42.78
29.02


1500
38.94
39.50

41.52
45.84
31.09


1600
41.53
42.14
44.29
48.89

33.16


1700
44.13
44.77
47.06
51.95
35.24



1750
45.42
46.09
48.44
53.48
36.27


1850

48.02
48.72
51.21
56.53
38.35


1950
50.62
51.35

53.98
59.59
40.42


2050
53.21
53.99
56.75
62.65

42.49


2150
55.81
56.62
59.52
65.70
44.56



2250
58.40
59.25
62.29
68.76
46.64


2350

61.00
61.89
65.05
71.81
48.71


2450
63.59
64.52

67.82
74.87
50.78


2550
66.19
67.15
70.59
77.93

52.85


2650
68.79
69.79
73.36
80.98
54.93



2750
71.38
72.42
76.13
84.04
57.00


2850

73.98
75.05
78.90
87.09
59.07


2950
76.57
77.69

81.66
90.15
61.15


3050
79.17
80.32
84.43
93.20

63.22


3150
81.76
82.95
87.20
96.26
65.29



3250
84.36
85.59
89.97
99.32
67.36


3350

86.96
88.22
92.74
102.37
69.44


3450
89.55
90.85

95.51
105.43
71.51


3550
92.15
93.49
98.27
108.48

73.58


3650
94.74
96.12
101.04
111.54
75.66



3750
97.34
98.75
103.81
114.60
77.73


3850

99.93
101.39
106.58
117.65
79.80


3950
102.53
104.02

109.35
120.71
81.87


4050
105.13
106.65
112.11
123.76

83.95


4150
107.72
109.29
114.88
126.82
86.02



4250
110.32
111.92
117.65
129.88
88.09


4350

112.91
114.56
120.42
132.93
90.16


4450
115.51
117.19

123.19
135.99
92.24


4550
118.10
119.82
125.96
139.04

94.31


4650
120.70
122.46
128.72
142.10
96.38



4750
123.30
125.09
131.49
145.15
98.46


4850

125.89
127.72
134.26
148.21
100.53


4950
128.49
130.36

137.03
151.27
102.60


5050
131.08
132.99
139.80
154.32

104.67




	
	FSJ Gearing -  2.72 gears
	
	speed = (rpm * dia * pi * 60) / (gears *12 *5280)


 

P235
30x9.5
31x10.5
35x12.5
35x12.5


Gears:
2.72
2.72

2.72
2.72
4.88


Tires:
28.88
29.30
30.80
34.00

34.00


tach
mph
mph
mph
mph
mph



600
18.95
19.23
20.21
22.31
12.44


700

22.11
22.43
23.58
26.03
14.51


800
25.27
25.64

26.95
29.75
16.58


900
28.43
28.84
30.32
33.47

18.65


1000
31.59
32.05
33.69
37.19
20.73



1100
34.75
35.25
37.06
40.91
22.80


1200

37.90
38.46
40.42
44.62
24.87


1300
41.06
41.66

43.79
48.34
26.95


1400
44.22
44.87
47.16
52.06

29.02


1500
47.38
48.07
50.53
55.78
31.09



1600
50.54
51.27
53.90
59.50
33.16


1700

53.70
54.48
57.27
63.22
35.24


1750
55.28
56.08

58.95
65.08
36.27


1850
58.44
59.29
62.32
68.80

38.35


1950
61.60
62.49
65.69
72.52
40.42



2050
64.75
65.70
69.06
76.23
42.49


2150

67.91
68.90
72.43
79.95
44.56


2250
71.07
72.11

75.80
83.67
46.64


2350
74.23
75.31
79.17
87.39

48.71


2450
77.39
78.51
82.53
91.11
50.78



2550
80.55
81.72
85.90
94.83
52.85


2650

83.71
84.92
89.27
98.55
54.93


2750
86.87
88.13

92.64
102.27
57.00


2850
90.02
91.33
96.01
105.98

59.07


2950
93.18
94.54
99.38
109.70
61.15



3050
96.34
97.74
102.75
113.42
63.22


3150

99.50
100.95
106.12
117.14
65.29


3250
102.66
104.15

109.48
120.86
67.36


3350
105.82
107.36
112.85
124.58

69.44


3450
108.98
110.56
116.22
128.30
71.51



3550
112.14
113.77
119.59
132.02
73.58


3650

115.29
116.97
122.96
135.73
75.66


3750
118.45
120.18

126.33
139.45
77.73


3850
121.61
123.38
129.70
143.17

79.80


3950
124.77
126.58
133.07
146.89
81.87



4050
127.93
129.79
136.43
150.61
83.95


4150

131.09
132.99
139.80
154.33
86.02


4250
134.25
136.20

143.17
158.05
88.09


4350
137.41
139.40
146.54
161.77

90.16


4450
140.56
142.61
149.91
165.48
92.24



4550
143.72
145.81
153.28
169.20
94.31


4650

146.88
149.02
156.65
172.92
96.38


4750
150.04
152.22

160.02
176.64
98.46


4850
153.20
155.43
163.38
180.36

100.53


4950
156.36
158.63
166.75
184.08
102.60



5050
159.52
161.84
170.12
187.80
104.67



	
	FSJ Gearing -  3.73 gears

	
	speed = (rpm * dia * pi * 60) / (gears *12 *5280)


 
P235
30x9.5
31x10.5
35x12.5
35x12.5



Gears:
3.73
3.73
3.73
3.73
4.88


Tires:

28.88
29.30
30.80
34.00
34.00


tach
mph
mph

mph
mph
mph


600
13.82
14.02
14.74
16.27

12.44


700
16.12
16.36
17.20
18.98
14.51



800
18.43
18.70
19.65
21.69
16.58


900

20.73
21.03
22.11
24.41
18.65


1000
23.03
23.37

24.57
27.12
20.73


1100
25.34
25.71
27.02
29.83

22.80


1200
27.64
28.04
29.48
32.54
24.87



1300
29.94
30.38
31.94
35.25
26.95


1400

32.25
32.72
34.39
37.97
29.02


1500
34.55
35.05

36.85
40.68
31.09


1600
36.85
37.39
39.31
43.39

33.16


1700
39.16
39.73
41.76
46.10
35.24



1750
40.31
40.90
42.99
47.46
36.27


1850

42.61
43.23
45.45
50.17
38.35


1950
44.92
45.57

47.90
52.88
40.42


2050
47.22
47.91
50.36
55.59

42.49


2150
49.52
50.24
52.82
58.30
44.56



2250
51.83
52.58
55.27
61.02
46.64


2350

54.13
54.92
57.73
63.73
48.71


2450
56.43
57.25

60.19
66.44
50.78


2550
58.74
59.59
62.64
69.15

52.85


2650
61.04
61.93
65.10
71.86
54.93



2750
63.34
64.27
67.56
74.57
57.00


2850

65.65
66.60
70.01
77.29
59.07


2950
67.95
68.94

72.47
80.00
61.15


3050
70.25
71.28
74.93
82.71

63.22


3150
72.56
73.61
77.38
85.42
65.29



3250
74.86
75.95
79.84
88.13
67.36


3350

77.16
78.29
82.29
90.84
69.44


3450
79.47
80.62

84.75
93.56
71.51


3550
81.77
82.96
87.21
96.27

73.58


3650
84.08
85.30
89.66
98.98
75.66



3750
86.38
87.63
92.12
101.69
77.73


3850

88.68
89.97
94.58
104.40
79.80


3950
90.99
92.31

97.03
107.12
81.87


4050
93.29
94.65
99.49
109.83

83.95


4150
95.59
96.98
101.95
112.54
86.02



4250
97.90
99.32
104.40
115.25
88.09


4350

100.20
101.66
106.86
117.96
90.16


4450
102.50
103.99

109.32
120.67
92.24


4550
104.81
106.33
111.77
123.39

94.31


4650
107.11
108.67
114.23
126.10
96.38



4750
109.41
111.00
116.69
128.81
98.46


4850

111.72
113.34
119.14
131.52
100.53


4950
114.02
115.68

121.60
134.23
102.60


5050
116.32
118.01
124.06
136.95

104.67



	
	FSJ Gearing -  4.09 gears
	
	speed = (rpm * dia * pi * 60) / (gears *12 *5280)


 
P235

30x9.5
31x10.5
35x12.5
35x12.5


Gears:
4.09
4.09
4.09

4.09
4.88


Tires:
28.88
29.30
30.80
34.00
34.00



tach
mph
mph
mph
mph
mph


600

12.60
12.79
13.44
14.84
12.44


700
14.70
14.92

15.68
17.31
14.51


800
16.81
17.05
17.92
19.78

16.58


900
18.91
19.18
20.16
22.26
18.65



1000
21.01
21.31
22.40
24.73
20.73


1100

23.11
23.44
24.64
27.20
22.80


1200
25.21
25.57

26.88
29.68
24.87


1300
27.31
27.71
29.12
32.15

26.95


1400
29.41
29.84
31.36
34.62
29.02



1500
31.51
31.97
33.61
37.10
31.09


1600

33.61
34.10
35.85
39.57
33.16


1700
35.71
36.23

38.09
42.04
35.24


1750
36.76
37.30
39.21
43.28

36.27


1850
38.86
39.43
41.45
45.75
38.35



1950
40.96
41.56
43.69
48.23
40.42


2050

43.06
43.69
45.93
50.70
42.49


2150
45.16
45.82

48.17
53.17
44.56


2250
47.27
47.95
50.41
55.64

46.64


2350
49.37
50.08
52.65
58.12
48.71



2450
51.47
52.22
54.89
60.59
50.78


2550

53.57
54.35
57.13
63.06
52.85


2650
55.67
56.48

59.37
65.54
54.93


2750
57.77
58.61
61.61
68.01

57.00


2850
59.87
60.74
63.85
70.48
59.07



2950
61.97
62.87
66.09
72.96
61.15


3050

64.07
65.00
68.33
75.43
63.22


3150
66.17
67.13

70.57
77.90
65.29


3250
68.27
69.26
72.81
80.38

67.36


3350
70.37
71.40
75.05
82.85
69.44



3450
72.47
73.53
77.29
85.32
71.51


3550

74.57
75.66
79.53
87.80
73.58


3650
76.67
77.79

81.77
90.27
75.66


3750
78.78
79.92
84.01
92.74

77.73


3850
80.88
82.05
86.25
95.21
79.80



3950
82.98
84.18
88.49
97.69
81.87


4050

85.08
86.31
90.73
100.16
83.95


4150
87.18
88.45

92.97
102.63
86.02


4250
89.28
90.58
95.21
105.11

88.09


4350
91.38
92.71
97.45
107.58
90.16



4450
93.48
94.84
99.69
110.05
92.24


4550

95.58
96.97
101.94
112.53
94.31


4650
97.68
99.10

104.18
115.00
96.38


4750
99.78
101.23
106.42
117.47

98.46


4850
101.88
103.36
108.66
119.95
100.53



4950
103.98
105.50
110.90
122.42
102.60


5050

106.08
107.63
113.14
124.89
104.67





Last Updated on 3/22/01

By John Meister