12-bolt "main", 12-bolt rear - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

Classics (Star Chief and 1957 to 1986) Converse about your Classic Bonneville.

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Old 04-22-2006, 11:37 PM   #11
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GM 10bolt 8.5" rear diff...most common GM diff pretty much..
That'* what I run in my Firebirds.
It does have 10 bolts that hold the ring gear to the carrier.
A 12 bolt has a larger ring gear and 12 bolts that hold its ring gear to the carrier. That way it can handle higher torque loads.

The covers are shaped differently.
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Old 04-23-2006, 02:10 AM   #12
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yup, covers are almost always different between different Diffs..
u should see The Dana Diffs parts catalouge, it gets really intresting to find the right parts somedays..
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