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Old 12-07-2011, 08:38 PM
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looking to find-out what the gears are in rear of 57 Chevy

I'm looking to find-out what the gears are on the limited slip rear I have on my 57 Chevy.

The rear-end differential has the following stamping: 1249516. It also has GM12 on the other side.

I could really use the help.

Thanks

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Old 12-09-2011, 06:35 PM
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rotate drive shaft.

jack up both wheels. ,,put it on jackstands. Chalk mark the tires and drive shaft , then turn the drive shaft and count how many turns to get BOTH tires to turn over ONE time then do the math , If a non limited slip. block one wheel so it wont turn then count how many turns on the drive shaft to get ONE tire to turn over TWO times
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Old 12-11-2011, 03:04 PM
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Thanks for the input.

What gear ratio would work better overall a 3.73 or 4.11
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Old 12-11-2011, 04:25 PM
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Best ??

Best depends on a lot of things. What size of rear tires. how will the car be used or raced, What is the torque curve of the engine, what are the trans gear ratios.
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Old 12-13-2011, 09:20 AM
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A simple answer: 4.11 would give more torque, fast startup, but the top speed a every gear would be 10% more with 3.73. So for stock and daily drive, i would go for 3.73.
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