Gearing for Speed!
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Engine RPM 7800 RPM
Clutch 90% = 7020 RPM
2x4 Sport/TrailBlazer Trans Ratio = 2.68 to 1 = 2619 RPM
4x4 Scrambler Trans Ratio = 2.82 to 1 = 2489 RPM
[To convert to Scrambler gearing = Multiply (sport) MPH x .95 = Scr MPH (converted to Scrambler)]
Example: 74x.95=70.3

2x4 Sport-TrailBlazer 2.68 to 1 trans.

13-36 = 2.77 to 1 = 945 RPM at wheel
13-34 = 2.62 to 1 = 1000 RPM at wheel
13-30 = 2.31 to 1 = 1134 RPM at wheel
14-30 = 2.14 to 1 = 1224 RPM at wheel
15-30 = 2.00 to 1 = 1309 RPM at wheel
16-28 = 1.75 to 1 = 1497 RPM at wheel

Rear Chain Ratio

18" Tires = 57" circumference

20" Tires = 63" circumference

22" Tires = 69" circumference

22.5" Tires = 71" circumferen

23.5" Tires = 73.8" circumfer

25" Tires = 78.5" circumferen

13/36

51 mph

56 mph

62 mph

64 mph

66 mph

70 mph

13/34

54 mph

60 mph

65 mph

67 mph

70 mph

74 mph

13/30

61 mph

68 mph

74 mph

76 mph

79 mph

84 mph

14/30

66 mph

73 mph

80 mph

82 mph

86 mph

91 mph

15/30

71 mph

78 mph

85 mph

88 mph

91 mph

97 mph

16/28

81 mph

89 mph

98 mph

101 mph

104 mph

111 mph

These specs are for what you think you could run for speed. Your ultimate top speed will be about 10 to 15% faster. Tire growth NOT included.

NOTE: Some tires may grow 1" or more at 100 mph