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Old 02-23-2012, 01:01 PM
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How to ID rear end

I was told by the guy I bought my coupe from that he was pretty sure the rear end was out of a '57 chevy. How can I know for sure and how to determine the gear ratio? Supposedly it is 3:08 or close to it.
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Old 02-23-2012, 01:23 PM
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If it has a drop out centre section like a ford 9" has then it probably is from a 57. To figure the ratio put a mark on your tire, rotate it one time and count the number of times the input yoke turns. That'll get you close.
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Old 02-23-2012, 01:27 PM
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You'll probably have to google a pic of the '57 rear but as far as the ratio you can turn the pinion yoke or driveshaft and count how many turns it takes to 1 turn of the tire. If you mark them with tape or something like that it makes it a lot easier to see. ..3 turns to 1 = close to a 3:00 to 1, 3 1/2 turns = 3:50 to 1 ....etc,
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Old 02-23-2012, 01:54 PM
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If it's a posi, nu8mber of driveshaft turns to one turn of the tire. If its an open differential, leave one tire on the ground and spin the free tire two turns. The spider gears have a 2 to 1 ratio.
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Old 02-23-2012, 11:21 PM
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Quote:
Originally Posted by rusty duck
I was told by the guy I bought my coupe from that he was pretty sure the rear end was out of a '57 chevy. How can I know for sure and how to determine the gear ratio? Supposedly it is 3:08 or close to it.
Thanks
Couple links for ya':

How to check your gear ratio is HERE.

Crankshaft Coalition Wiki article on Chevy rear ends is HERE.

Good luck.
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Old 02-24-2012, 12:39 PM
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ID the rear end

On the open positraction rear end does it matter which tire is on the ground when you spin the tire to get the ratio?
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Old 02-24-2012, 01:50 PM
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No! I generally leave the passengers side down, but it doesn't matter.
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Old 02-24-2012, 11:21 PM
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I.D rear end

Thanks for the information.
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