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Author Topic:   rear end
blade
Dirt Full Roller

Total posts: 38
posted December 06, 2005 05:34 PM  
i have a rear end from a 70s camaro which is a 10 bolt will the gear from a 74 chevelle with a 10 bolt in it fit? also i have some rear end from early 70s chevelles 71 &72 10 bolts will these fit also?

john56h
Dirt Roller

Total posts: 19
posted December 06, 2005 06:58 PM  
There is a lot of interchangeabitity among GM ten bolt rearends, but there are 8.5" and 8.2" ten bolts. Generally speaking the 8.5" ring gear is found in GM cars from 1971 or newer. The 8.5" gears will fit Chevy, Buick, Pontiac and Oldsmobile as well as some light trucks. The 8.2" is found in 1970 and older (back to 64) GM cars. The 8.2" ring gears from a Chevy will not fit the Buick/Olds/Pontiac rear and vice-versa. All that being said...the 1970-72 era is a little strange because some 1970 Camaros had the 8.5" (exception to the "rule") and some 71 & 72 Chevelles had 8.2" (again an exception to the "rule"), so you'll have to check carefully when using rearend components from those years. Usually the 8.5" rears have a little bigger u-joint than the 8.2" does. They are both good rearends, but there are more gear ratios available for the 8.5" rear.

blade
Dirt Full Roller

Total posts: 38
posted December 08, 2005 05:14 PM  
how do i tell a 8.2 from an 8.45?

oceanridge motorsports
Dirt Full Roller

Total posts: 41
posted December 08, 2005 06:29 PM  
If it's late 70's it could also be a 7.5 ?

john56h
Dirt Roller

Total posts: 19
posted December 08, 2005 07:44 PM  
The 8.5" GM rearend has left hand threads (must turn clockwise to loosen) on the ring gear to carrier. That's one easy way once the cover is off. The 7.5" Metric rear also has left hand threads, but is quite a bit smaller (1 inch smaller ring gear diameter) and usually has axle tubes that are less than 3" O.D. Also the cover is kind of squared off in shape whereas the 8.5 and 8.2 have an almost round cover. The 8.2" Chevrolet rearend cover usually has a unique shape to the stamping because there are leaders stamped in the cover that feed oil to the carrier bearings near where the center housing attaches to the axle tubes. The 12 bolt Chevy rears have this type cover too, but with 12 bolts. The 8.5" doesn't have these leaders in the cover.

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