10-bolt
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The 10-bolt rear end was the base rear on 1st through 4th generation Camaros. It got the name 10-bolt because there are 10 bolts that hold the differntial cover to the housing.
The 3rd and 4th generation cars only had a 7.5" ring gear that was smaller and weaker than the rears on earlier cars. It is common for the rear to break on these cars, especially when used with sticky tires.