To get an estimated axle ratio jack up one side of the rear end, put a chalk mark on the drive shaft and a mark on the tire, rotate the tire 1 revolution and count how many times the drive shaft turns.
1 rotation of tire, 2 3/4 rotation of drive shaft = 2.75 gear ratio (2.79)
1 tire, 3 1/4 drive shaft = 3.25 (3.11)
1 tire, 3 1/2 drive shaft = 3.50 (3.56)
All numbers are approximate.
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