Just FYI the 8.5 10 bolt is plenty strong, and are priced much lower than 12 bolts. Mid 70s Z rears can be found with 3:73 posis, and are a great rear. They are 1/2" wider on each end than a 67-9 rear, but by only relocating the leaf pads they WILL fit ok in the 1st gen cars. You can usually find these rears for $300 or less, where as the 12 bolts are commonly $600 and up.
I've never seen any Camaro from 71-81 that came with a 7.5 rear. The third Gen's came with them, but not 2nd Gen's. All 70-81 Camaros came with a leaf spring mounted rear.
"The 1970 rear end differs from the 1971-1981 rear end. In 1970 the rear end was built in both 10 and 12 bolt versions. In 1971, GM instituted a standardized "corporate" rear axle. This rear end was available in a 10 bolt version only." Quoted from: www.nastyz28.com
1982 was the first year of coils in the rear. Most of these were the 7.5 version.
The 8.5 "corporate" rear was designed to replace both the 8.2 and the 12-bolt, which it did for sure in 1971.
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