10 Spline
Quick Change Gears
P/N 8500, Series
SAE 8620 Steel, Crown Cut, 10 Spline Quick Change Gears. When ordering
add Prefix 85 To Set Number. Example 8501
1580 Trolley Road
York, PA 17408 USA
Ph.: 717.764.9844
Fax: 717.764.0617
www.wintersperformance.com
Remember to refill gear cavity
with good quality gear lube after
quick change gear changes.
Gear
Set #
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
4.12 R&P Ratio
(8-33 Teeth)
4.57 R&P Ratio
(7-32 Teeth)
4.86 R&P Ratio
(7-34 Teeth)
Low Spur
Ratio
High Spur
Ratio
No. of
Teeth
Low
High
Low
High
Low
High
1.000
0.964
0.960
0.955
0.950
0.931
0.920
0.909
0.897
0.885
0.875
0.867
0.857
0.852
0.846
0.840
0.833
0.826
0.815
0.806
0.800
0.793
0.786
0.783
0.778
0.774
0.769
0.760
0.750
0.739
0.733
0.727
0.724
0.719
1.000
1.037
1.042
1.048
1.053
1.074
1.087
1.100
1.115
1.130
1.143
1.154
1.167
1.174
1.182
1.190
1.200
1.211
1.227
1.240
1.250
1.261
1.273
1.278
1.286
1.292
1.300
1.316
1.333
1.353
1.364
1.375
1.381
1.391
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
4.12
3.97
3.96
3.93
3.91
3.84
3.79
3.75
3.69
3.65
3.61
3.57
3.53
3.51
3.49
3.46
3.43
3.40
3.36
3.32
3.30
3.27
3.24
3.22
3.20
3.19
3.17
3.13
3.09
3.05
3.02
3.00
2.97
2.96
4.12
4.27
4.29
4.32
4.34
4.43
4.48
4.53
4.60
4.66
4.71
4.75
4.81
4.84
4.87
4.91
4.94
4.99
5.06
5.11
5.15
5.20
5.24
5.26
5.30
5.32
5.36
5.42
5.49
5.57
5.62
5.67
5.69
5.73
4.57
4.41
4.39
4.36
4.34
4.26
4.20
4.16
4.10
4.04
4.00
3.96
3.92
3.89
3.87
3.84
3.81
3.78
3.72
3.69
3.66
3.62
3.59
3.58
3.55
3.54
3.52
3.47
3.43
3.38
3.35
3.32
3.31
3.29
4.57
4.74
4.76
4.79
4.81
4.91
4.97
5.03
5.10
5.17
5.22
5.27
5.33
5.37
5.40
5.44
5.48
5.53
5.61
5.67
5.71
5.76
5.82
5.84
5.88
5.90
5.94
6.01
6.09
6.18
6.23
6.28
6.31
6.36
4.86
4.69
4.67
4.64
4.62
4.53
4.47
4.42
4.36
4.30
4.25
4.21
4.17
4.14
4.11
4.08
4.05
4.02
3.96
3.92
3.89
3.85
3.82
3.80
3.78
3.76
3.74
3.69
3.65
3.59
3.56
3.54
3.52
3.49
4.86
5.04
5.06
5.09
5.11
5.22
5.28
5.34
5.42
5.49
5.55
5.60
5.67
5.70
5.74
5.78
5.83
5.88
5.96
6.02
6.07
6.12
6.18
6.21
6.25
6.27
6.31
6.39
6.48
6.57
6.62
6.68
6.71
6.76
(Numerical Ratio Listed)
©2008 Winters Performance Products, Inc. See current catalog or web site for warranty disclaimer.
10 Spline
Quick Change Gears
To Determine Gear RPM Change:
(RPM) ÷(Gear Ratio) x (New Ratio) = (New RPM)
Example 8000 ÷
6.58
x 6.35
=
7720
To Determine Final Drive:
(# Teeth Top Gear) ÷ (# Teeth Bottom Gear) x R&P Ratio = Final Drive
1580 Trolley Road
York, PA 17408 USA
Ph.: 717.764.9844
Fax: 717.764.0617
www.wintersperformance.com
Gearing Formulas
Ratio x MPH
x 336 = RPM
Tire DIA
or
Ratio =
Gear
Set #
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
RPM x Tire DIA
MPH x 336
4.12 R&P Ratio
(8-33 Teeth)
4.57 R&P Ratio
(7-32 Teeth)
4.86 R&P Ratio
(7-34 Teeth)
Low Spur
Ratio
High Spur
Ratio
No. of
Teeth
Low
High
Low
High
Low
High
0.714
0.708
0.704
0.697
0.690
0.680
0.677
0.667
0.655
0.652
0.647
0.640
0.633
0.630
0.625
0.621
0.615
0.613
0.607
0.600
0.593
0.588
0.583
0.577
0.571
0.567
0.563
0.559
0.556
0.552
0.548
0.533
0.531
1.400
1.412
1.421
1.435
1.450
1.471
1.476
1.500
1.526
1.533
1.545
1.563
1.579
1.588
1.600
1.611
1.625
1.632
1.647
1.667
1.688
1.700
1.714
1.733
1.750
1.765
1.778
1.789
1.800
1.813
1.824
1.875
1.882
20/28
17/24
19/27
23/33
20/29
17/25
21/31
22/33
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
15/27
16/29
17/31
16/30
17/32
2.94
2.92
2.90
2.87
2.84
2.80
2.79
2.75
2.70
2.69
2.67
2.64
2.61
2.59
2.58
2.56
2.54
2.53
2.50
2.47
2.44
2.42
2.40
2.38
2.35
2.34
2.32
2.30
2.29
2.27
2.26
2.20
2.19
5.77
5.82
5.86
5.91
5.97
6.06
6.08
6.18
6.29
6.32
6.37
6.44
6.51
6.54
6.59
6.64
6.70
6.72
6.81
6.87
6.95
7.00
7.06
7.14
7.21
7.27
7.32
7.37
7.42
7.47
7.51
7.73
7.76
3.26
3.24
3.22
3.19
3.15
3.11
3.10
3.05
2.99
2.98
2.96
2.93
2.89
2.88
2.86
2.84
2.81
2.80
2.76
2.74
2.71
2.69
2.67
2.64
2.61
2.59
2.57
2.55
2.54
2.52
2.51
2.44
2.43
6.40
6.45
6.49
5.65
6.63
6.72
6.75
6.86
6.98
7.01
7.06
7.14
7.22
7.26
7.31
7.36
7.43
7.46
7.53
7.62
7.71
7.77
7.83
7.92
8.00
8.07
8.12
8.18
8.23
8.28
8.33
8.57
8.60
3.47
3.44
3.42
3.39
3.35
3.31
3.29
3.24
3.18
3.17
3.15
3.11
3.08
3.06
3.04
3.02
2.99
2.98
2.95
2.92
2.88
2.86
2.84
2.80
2.78
2.75
2.73
2.72
2.70
2.68
2.67
2.59
2.58
6.80
6.86
6.90
6.97
7.04
7.14
7.17
7.29
7.41
7.45
7.51
7.59
7.67
7.71
7.77
7.83
7.89
7.93
8.00
8.10
8.20
8.26
8.33
8.42
8.50
8.57
8.64
8.69
8.74
8.80
8.86
9.11
9.14
Note: Gear Set Numbers 50-58 Are For Limited Horsepower Applications Only!
(Numerical Ratio Listed)
©2008 Winters Performance Products, Inc. See current catalog or web site for warranty disclaimer.