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Old 03-01-2004, 08:12 AM
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3.73 Rear Identification

Hey guys,

I have a 69 camaro I bought from a guy that has had a fair amount of work done to it. I want to find out what rear gear ratio it has because the previous owner didn't know. Is there a simple way I can tell? I have heard that if I lift the car spin the rear tire 1 revolution while counting the number of times the driveshaft turns will tell me. Is this accurate or is there another way? Your help is always appreciated.

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Old 03-01-2004, 09:21 AM
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That way isn't very accurate, it basically gives you a ballpark figure, if you want to know exactly what gear ratio you have its easy. Just take the rear end cover off and drain your gear lube, then you just need to count the number of teeth on your ring gear and the number of teeth on your pinion gear and divide those numbers. For example, 3.73 gears would be 41 ring teeth and 11 pinion teeth.
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Old 03-01-2004, 02:10 PM
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Ball Park

Most of us want to know what ball park we are in, so your way will work fairly close. 3 and 3/4 turns says 3.75 and that is very close. But dead nuts is to open and count. But don't get hung up on numbers. The engine rmp / tranny gearing / rear gear / and tire size all contribute to the final out come. Change the tire size and the whole system changes.

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