The following equations and rules apply only to 4-cycle engines powered by pump gasoline. The equations have been simplified for ease of understanding. Answers will approximate, but generally close enough for use as a guideline.

## MPH

Tire Radius RPM Rear End Ratio Transmission Gear Ratio =MPH

## RPM

Rear End Ratio Transmission Gear Ratio MPH Tire Radius =RPM

## Calculated Gear Ratio (Trans. gear multiplied by rear end gear)

Tire Radius RPM MPH =Gear Ratio

## Transmission Gear (relative to variables of calculated gear ratio equation)

Calculated Gear Ratio Rear end ratio =Transmission gear ratio

## Rear end gear (relative to variables of calculated gear ratio equation)

Calculated gear ratio Transmission gear =Rear end gear

## Tire Radius

MPH Rear End Ratio Transmission Gear Ratio RPM =Tire Radius

 Transmission Engine code 1st 2nd 3rd 4th 5th 1982 TH-200C All 2.74 1.57 1.00 1982 4-sp Muncie LQ8/LQ9 3.50 2.48 1.66 1.00 LC1 3.60 2.48 1.66 1.00 LG4 3.42 2.28 1.45 1.00 LU5 2.88 1.91 1.33 1.00 1983 TH-200C LQ8/LQ9 2.74 1.57 1.00 LC1 2.74 1.57 1.00 1983 TH-700R4 All 3.06 1.63 1.00 .70 1983 4-sp Muncie LQ8/LQ9 3.50 2.48 1.66 1.00 1983 5-sp Warner Gear LQ8/LQ9 3.50 2.14 1.36 1.00 .73 LC1 3.50 2.14 1.36 1.00 .73 LG4 2.95 1.94 1.34 1.00 .73 1984 TH-700R4 LQ9 3.06 1.63 1.00 .70 LC1 3.06 1.63 1.00 .70 LG4 3.06 1.63 1.00 .70 L69-HO 3.06 1.63 1.00 .70 1984 4-sp Muncie LQ9 3.50 2.48 1.66 1.00 1984 5-sp Warner Gear LQ9 3.76 2.18 1.42 1.00 .72 LC1 3.50 2.14 1.39 1.00 .78 LG4 2.95 1.94 1.34 1.00 .73 L69-HO 2.95 1.94 1.34 1.00 .73 1985 TH-700R4 ALL 3.06 1.63 1.00 .70 1985 5-sp Warner Gear LQ9 3.76 2.18 1.42 1.00 .72 LB8 4.03 2.37 1.50 1.00 .76 LG4 2.95 1.94 1.34 1.00 .63 L69-HO 2.95 1.94 1.34 1.00 .63 1986 TH-700R4 ALL 3.06 1.63 1.00 .70 1986 5-sp Warner Gear LQ9 3.76 2.18 1.42 1.00 .86 LB8 3.50 2.14 1.36 1.00 .78 LG4 2.95 1.94 1.34 1.00 .63 LG4 3.35 1.93 1.29 1.00 .63 L69-HO 2.95 1.94 1.34 1.00 .63 L69-HO 3.35 1.93 1.29 1.00 .61 1987 TH-700R4 ALL 3.06 1.63 1.00 .70 1987 5-sp Warner Gear LB8 4.03 2.37 1.50 1.00 .76 LG4 2.95 1.94 1.34 1.00 .63 LB9 2.95 1.94 1.34 1.00 .63 LB9 2.95 1.94 1.34 1.00 .73 1988 TH-700R4 ALL 3.06 1.63 1.00 .70 1988 5-sp Warner Gear LB8 4.03 2.37 1.50 1.00 .76 LO3 2.95 1.94 1.34 1.00 .63 LB9 2.95 1.94 1.34 1.00 .73 1989-1992 Not available yet, but here are a couple that are belived to be correct. 1992 T5 2.68 1.80 1.31 1.00 .75 1991 T5 LO3 2.95 1.94 1.34 1.00 .63 T5 TPI Induction 2.75 1.94 1.34 1.00 .74 4L60-E 3.06 1.62 1.00 .70