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are these 3:08s????

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Old 02-27-2008, 02:58 PM
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i have a very low mileage ring and pinion and i was told that there 3:08, how can i tell if its true i found a casting number on them GM 13:40 same number on ring and pinion.
Old 02-27-2008, 03:00 PM
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Yes they are.

Divide the teeth on the big ring gear by the teeth on the lil pinion gear and you'll get 3.076XXXXXXXX
Old 02-27-2008, 05:23 PM
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thanks for the help




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