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Old 12-06-1999, 11:18 AM   #3
red
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You can calculate the needed speedo gear teeth with the formula below.

speedo gear Teeth=Drive Gear Teeth (Times) Axle Ratio (Times) Tire Rev. Per Mile Divided By 1000

The drive gear teeth number on a 65/66 C4 is 7, if the cougar you took the trans out of had tall gears it might have a 6 spline tailshaft (6 drive gear teeth).

-JON
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