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Iron Diff Compatibility Question

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Old Jul 15, 2020 | 12:20 PM
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Default Iron Diff Compatibility Question

I'm sorry if this has been covered to death I did not find answers to my specific questions in my searches.

Will an iron diff from a '77 bolt to the frame of a '74?

Both cars were factory TH350 cars, both 3.08 cars, and there's going to be a mono spring change using the '77 diff as the year.

Thanks.
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Old Jul 15, 2020 | 12:29 PM
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It's the same type of differential. didnt change until 1980 to aluminum.
They both use the 2.25" width rear spring.
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Old Jul 15, 2020 | 12:40 PM
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Originally Posted by MelWff
It's the same type of differential. didnt change until 1980 to aluminum.
They both use the 2.25" width rear spring.
Thank you. The only thing I was concerned with was the cross member bolt pattern.

Were there different cover designs? Not that it matters, because the mono spring was bought for a '77.
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Old Jul 16, 2020 | 07:35 AM
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Pretty sure you can use a diff from 64 to 77. Apparently there is strength differences if you race or manhandle them too much. The 64 to 66 had week clutch housing, and as I understand it the 69 to 70 something had a stronger case. There’s some threads on it if you want to get deep in the weeds. You’ll be fine
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Old Jul 16, 2020 | 10:34 AM
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Mark, just do a search on the C3 TECH/PERFORMANCE Forum for GTR1999. You will find the answer to just about any question you might have regarding the rear suspension of the C2-C3 Corvettes. You may need to do a bit of reading to find the answer to a specific question, but you'll learn a lot along the way.

Gary Ramadi's (GTR1999) answers are filled with technical data and spec's so the reading is always informative. You can also send him a PM if you have difficulty finding a specific answer or are confused by a post. He's exceptionally detailed and knowledgeable regarding these cars and a great example of what makes the Corvette Forum such a terrific place to visit.

Here's just one post I found with some great info regarding the '77 rear differential in an answer Gary provided to a members question... https://www.corvetteforum.com/forums...d-rebuild.html

Good luck... GUSTO

Last edited by GUSTO14; Jul 16, 2020 at 10:51 AM.
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