C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

F-body trans in C4?

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Old Sep 5, 2010 | 10:03 AM
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Default F-body trans in C4?

Will a 700-r4 from a late 80's IROC be a direct bolt in in an '88 Corvette?
aside from swapping the tailshaft housing
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Old Sep 5, 2010 | 10:38 AM
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No, tailshaft is different
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Old Sep 5, 2010 | 10:47 AM
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Originally Posted by twin540
No, tailshaft is different


You would have to swap the tail shaft as well as the housing.

Swapping the tail shaft pretty much involves disassembling the whole trans.
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Old Sep 5, 2010 | 10:50 AM
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No, The transmission Mainshaft spline is shorter in length on a C4 Corvette. Around 7/8" shorter I have heard.

Would require disassembling the IROC Transmission to swap out the Output mainshaft.

I have heard of a few people cutting the splined output shaft to what they need to meet their own needs without disassembling the entire trans. Used tape and shop rags to cover up openings. Then Using a Cutoff wheel to trim the output shaft.

Dirty way of getting it done.

But if you look at an original C4 700R4 Mainshaft-output shaft closely, it was cut off originally by GM with a bandsaw from a longer Mainshaft. You can clearly see the saw or tooling marks where the cut was made.

Where there is a will, there is a way to get it done as you want it.
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