1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 TRANSMISSION 1ST GEAR

Part Number: 96-642

TRANSMISSION 1ST GEAR - Part Number 96-642
3.24 stock ratio 1st gears of high nickle steel with lead-in ramps for quicker, more positive shifting. Since we get many questions regarding transmission gear ratios, a table of values for EV-80 transmission is shown below along with an explanation of how the actual numbers are determined. The internal ration (in any gear) is a combination of the speed gear ratio and the main drive gear ratio. The numbers below are the numbers of teeth on each mating pair of gears. * Gear -1st (Stk.), 32/17 Main drive, 31/18 Speed gear, 3.24 Overall ratio, 32% RPM drop, 6.81 MPH per 1000 RPM * Gear -1st (Close), 32/17 Main drive, 25/16 Speed gear, 2.94 Overall ratio, 25% RPM drop, 7.50 MPH per 1000 RPM * Gear -2nd, 32/17 Main drive, 27/23 Speed gear, 2.21 Overall ratio, 27% RPM drop, 9.99 MPH per 1000 RPM * Gear -3rd, 32/17 Main drive, 23/27 Speed gear, 1.60 Overall ratio, 23% RPM drop, 13.79 MPH per 1000 RPM * Gear -4th, 32/17 Main drive, 19/29 Speed gear, 1.23 Overall ratio, 19% RPM drop, 17.94 MPH per 1000 RPM * Gear -5th, 32/17 Main drive, Direct drive speed gear, 1.00 Overall ratio, 22.07 MPH per 1000 RPM To calculate the internal gear ratio in 2nd gear for example, multiply 32/17 times 27/23; (32/17 x 27/23) = 2.21. To calculate MPH per 1000 engine RPM: (assuming a 25" dia, rear wheel and a stock 3.37 final drive ratio); (25 x 3.14159) / 12 x (1000 / (3.37 x 60) x (3.0 / 4.4.) = 22.07 MPH per 1000 engine RPM (in 5th gear). To calculate MPH per 1000 engine RPM in 3rd gear: Divide 22.07 by 1.60 (22.07 / 1.60) = 13.8 MPH per 1000 engine RPM (in 3rd gear). The 5 speed gear box has actually been around for several years but the growing number of modifications for the EV 1340 engine has created a lot more interest in it. In addition to close ratio first gears, Andrews Products also makes replacement gears for 2nd, 3rd, 4th and 5th gear sets. As with the close first gears, all 5 speed gears are made from high nickel alloy and heat treated and shot-peened to give maximum durability and strength. Also, where applicable, lead-in ramps have been machined into some gears to improve shifting and reduce wear on drive dogs and drive slots.
Andrews 1st main 18 teeth 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974

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