GEAR CHART FOR 10 SPLINE

FOR WINTER GEARS

To Determine Final Drive:
((# Teeth Top Gear) ÷ (# Teeth Bottom Gear)) * R&P Ratio = Final Drive
To Determine Gear RPM Change:
(RPM ÷ Gear Ratio) * New Ratio = New RPM
Example: (8000 ÷ 6.58) * 6.35 = 7720

P/N 8500 Series
SAE 8620 Steel, Standard Quick Change Gears.
When ordering, add prefix "85" to set number.
Example: 8501

P/N 9500 Series
SAE 9310 Steel, Quick Change Gears.
When ordering, add prefix "95" to set number.
Example: 9501
4.11 R&P Ratio
(9-37 Teeth)
4.57 R&P Ratio
(7-32 Teeth)
4.86 R&P Ratio
(7-34 Teeth)
Gear Set #
Low Spur Gear
High Spur Gear
No. of Teeth
Low/High
Low/High
Low/High
1
2
5
15A
15
26
6
25
12
7
7A
17
17A
8A
8
19
9A
9
11
3
13
18
18A
4A
20A
4
20
22
16
10
10A
34A
34
14
14A
35
32
32A
24
36
37
23
21
21A
27
43
28
28A
29
39
30
40
41
31
33A
33
31A
30A
50
51
52
53
54
55
56
57
58
1.00
0.96
0.96
0.95
0.95
0.93
0.92
0.90
0.89
0.88
0.87
0.86
0.85
0.85
0.84
0.84
0.83
0.82
0.81
0.80
0.80
0.79
0.79
0.78
0.78
0.77
0.76
0.76
0.75
0.73
0.73
0.72
0.72
0.71
0.71
0.70
0.70
0.70
0.69
0.68
0.67
0.67
0.65
0.65
0.64
0.64
0.63
0.63
0.62
0.62
0.61
0.61
0.61
0.60
0.59
0.58
0.58
0.57
0.57
0.56
0.56
0.55
0.55
0.55
0.54
0.53
0.53
1.00
1.03
1.04
1.05
1.05
1.07
1.08
1.10
1.11
1.13
1.14
1.15
1.16
1.17
1.18
1.19
1.20
1.21
1.22
1.24
1.25
1.26
1.27
1.28
1.29
1.29
1.30
1.32
1.33
1.35
1.36
1.37
1.38
1.39
1.40
1.41
1.42
1.43
1.45
1.47
1.48
1.50
1.52
1.53
1.54
1.56
1.57
1.59
1.59
1.61
1.62
1.63
1.65
1.67
1.69
1.70
1.71
1.73
1.75
1.76
1.78
1.79
1.80
1.81
1.82
1.87
1.88
21/21
27/28
24/25
21/22
19/20
27/29
23/25
20/22
26/29
23/26
21/24
26/30
24/28
23/27
22/26
21/25
25/30
19/23
22/27
25/31
20/25
23/29
22/28
18/23
21/27
24/31
20/26
19/25
18/24
17/23
22/30
16/22
21/29
23/32
20/28
17/24
19/27
23/33
20/29
17/25
21/31
22/23
19/29
15/23
22/34
16/25
19/30
17/27
15/24
18/29
16/26
19/31
17/28
21/35
16/27
20/34
21/36
15/26
20/35
17/30
18/32
19/34
20/36
16/29
17/31
16/30
17/32
4.11 / 4.11
3.96 / 4.26
3.95 / 4.28
2.92 / 4.31
3.91 / 4.33
3.83 / 4.41
3.78 / 4.46
3.74 / 4.52
3.68 / 4.58
3.63 / 4.64
3.58 / 4.69
3.54 / 4.76
3.52 / 4.80
3.50 / 4.82
3.48 / 4.85
3.54 / 4.89
3.42 / 4.93
3.39 / 4.97
3.35 / 5.04
3.31 / 5.10
3.29 / 5.14
3.26 / 5.18
3.23 / 5.23
3.21 / 5.26
3.21 / 5.30
3.18 / 5.31
3.16 / 5.34
3.12 / 5.41
3.08 / 5.48
3.04 / 5.56
3.01 / 5.60
2.99 / 5.65
2.98 / 5.68
2.95 / 5.72
2.93 / 5.76
2.91 / 5.80
2.89 / 5.85
2.87 / 5.89
2.83 / 5.96
2.80 / 6.04
2.78 / 6.07
2.74 / 6.17
2.70 / 6.27
2.68 / 6.30
2.66 / 6.35
2.63 / 6.42
2.60 / 6.49
2.59 / 6.53
2.57 / 6.58
2.55 / 6.62
2.53 / 6.68
2.52 / 6.71
2.50 / 6.77
2.47 / 6.85
2.44 / 6.94
2.42 / 6.99
2.40 / 7.05
2.37 / 7.12
2.35 / 7.19
2.33 / 7.25
2.31 / 7.30
2.29 / 7.35
2.28 / 7.39
2.27 / 7.45
2.25 / 7.49
2.19 / 7.70
2.18 / 7.74
4.57 / 4.57
4.41 / 4.71
4.39 / 4.75
4.36 / 4.79
4.34 / 4.80
4.25 / 4.91
4.20 / 4.97
4.15 / 5.03
4.10 / 5.10
4.04 / 5.15
4.00 / 5.22
3.96 / 5.27
3.92 / 5.33
3.89 / 5.36
3.87 / 5.40
3.84 / 5.44
3.81 / 5.48
3.78 / 5.53
3.72 / 5.61
3.69 / 5.67
3.66 / 5.71
3.62 / 5.76
3.59 / 5.82
3.58 / 5.84
3.56 / 5.90
3.54 / 5.90
3.52 / 5.94
3.47 / 6.01
3.43 / 6.09
3.38 / 6.18
3.35 / 6.23
3.32 / 6.28
3.31 / 6.31
3.28 / 6.36
3.26 / 6.40
3.24 / 6.45
3.22 / 6.49
3.19 / 6.56
3.15 / 6.63
3.11 / 6.72
3.10 / 6.75
3.05 / 6.86
2.99 / 6.98
2.98 / 7.01
2.96 / 7.06
2.92 / 7.14
2.89 / 7.22
2.88 / 7.26
2.86 / 7.31
2.84 / 7.36
2.81 / 7.43
2.80 / 7.46
2.77 / 7.53
2.74 / 7.62
2.71 / 7.71
2.69 / 7.77
2.67 / 7.83
2.64 / 7.92
2.61 / 8.00
2.59 / 8.06
2.57 / 8.12
2.55 / 8.18
2.54 / 8.23
2.52 / 8.28
2.51 / 8.33
2.44 / 8.57
2.43 / 8.60
4.86 / 4.86
4.68 / 5.04
4.66 / 5.07
4.64 / 5.09
4.63 / 5.10
4.52 / 5.23
4.47 / 5.28
4.42 / 5.35
4.36 / 5.42
4.30 / 5.49
4.23 / 5.54
4.19 / 5.64
4.17 / 5.67
4.14 / 5.71
4.11 / 5.75
4.08 / 5.78
4.05 / 5.83
4.01 / 5.88
3.96 / 5.97
3.92 / 6.03
3.89 / 6.08
3.85 / 6.13
3.82 / 6.19
3.80 / 6.21
3.79 / 6.27
3.76 / 6.28
3.75 / 6.32
3.69 / 6.39
3.65 / 6.48
3.59 / 6.58
3.56 / 6.63
3.53 / 6.68
3.52 / 6.71
3.50 / 6.76
3.47 / 6.81
3.44 / 6.86
3.42 / 6.90
3.39 / 6.97
3.35 / 7.04
3.30 / 7.15
3.29 / 7.19
3.24 / 7.29
3.20 / 7.42
3.17 / 7.45
3.15 / 7.52
3.11 / 7.59
3.08 / 7.68
3.06 / 7.72
3.04 / 7.78
3.02 / 7.83
2.99 / 7.91
2.89 / 7.93
2.95 / 8.00
2.92 / 8.10
2.88 / 8.20
2.85 / 8.26
2.84 / 8.34
2.80 / 8.42
2.77 / 8.50
2.75 / 8.57
2.73 / 8.64
2.71 / 8.69
2.69 / 8.75
2.68 / 8.81
2.66 / 8.86
2.59 / 9.11
2.58 / 9.15

Note: Gear Set Numbers 50 Through 58 Are For Limited Horsepower Applications Only!

A full-sized poster version of this chart is available, P/N Poster-10