1970 Camaro rearend

[DAVE H]

My good friend just scored this 12-bolt COZ coded rear off Marketplace. Looks to be completely original with the dated 3.73 gearset and Eaton posi. Uncut spring perches and all correct measurements. His question, (that I cannot answer) was this specific to a Z-28, RS, or ?? Thanks for any information I can relay to him.
Dave

[luzl78]

z and ss

[dustinm]

I seen that.. just didnt have the time to commit

[BCreekDave]

I think just Z. SS came with a 3.55 standard and option was 4.10. Z option was 4.10 too. I've never heard of a 3.73 SS.

[luzl78]

Originally Posted by BCreekDave

I think just Z. SS came with a 3.55 standard and option was 4.10. Z option was 4.10 too. I've never heard of a 3.73 SS.

ss l78 and 350 got the 12 bolt

[Big Block Bill]

Originally Posted by luzl78

ss l78 and 350 got the 12 bolt

I thought a 12 bolt came in any 1970 Camaro with any engine that had a 4bbl, but the 3:73
ratio was standard on the Z-28 with the 4:10 optional. I do not know about the L-78 in 1970,
so my vote is it came out a 1970 Z-28.

Bill

[L16pilot]

Originally Posted by Big Block Bill

I thought a 12 bolt came in any 1970 Camaro with any engine that had a 4bbl, but the 3:73
ratio was standard on the Z-28 with the 4:10 optional. I do not know about the L-78 in 1970,
so my vote is it came out a 1970 Z-28.

Bill

Correct Bill...only the Z28 could have gotten the 3.73s. L78s were 3.55 std and 4.10 optional.

[FTC]

WOW,........that's a score. Most 12 bolt Chevy rear ends are prices well over a grand,...with Camaro ones being even more. And, if that was a 1st gen piece, the price goes up.

[big gear head]

RS is an appearance package and has nothing to do with performance, so that wouldn't matter. I would think that it would be Z28 or maybe L78.

[L16pilot]

As Dave mentioned, 3.73s was a Z28 only ratio for 1970, but the COZ code was also used in '70 T/As as they shared the same 12-bolt as the Camaro that year. Either way, that's a great score!