12-bolt "main", 12-bolt rear
Junior Member
Joined: Jun 2002
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GM 10bolt 8.5" rear diff...most common GM diff pretty much..
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.
Senior Member
True Car Nut
Joined: May 2003
Posts: 8,135
Likes: 1
From: Lethbridge, Alberta, _______Canada._______ West Coast Bonneville Fest ___05,06,07 Survivor___
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..
u should see The Dana Diffs parts catalouge, it gets really intresting to find the right parts somedays..
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