telling your gear ratio
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Joined: Dec 2001
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From: Wichita, KS USA
telling your gear ratio
i just bought this 83 z... it has a 383 stroker with around 400 hp,, the guy wasn't sure what gear ratio was in it and i was wondering if theres a way to do it w/o taking it apart
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Jack up and support the rear. Put in neutral, take off park brake. Assuming it has a posi, turn a wheel exactly one turn, and count the number of times the driveshaft goes around. A 2.73 ratio will turn about 2-3/4 times; 3.23 about 3-1/4 times; 3.73 about 3-3/4 times, etc.
The only exact way to know is to pull the diff cover and divide the number of ring gear teeth by the number of pinion gear teeth and round off to 2 places. Good excuse to change the gear lube at the same time (probably needs it).
The only exact way to know is to pull the diff cover and divide the number of ring gear teeth by the number of pinion gear teeth and round off to 2 places. Good excuse to change the gear lube at the same time (probably needs it).
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