Quote:
Originally Posted by BarryB
So basically there all the same all the years?
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No, they're not.
Outer dimensions are the same, but the earlier transmissions suffered many internal failures. If hunting for a 700R4 go for a 86 and later transmission. Up to 91, will all work. In 91 Gm changed the name to a 4L60, but it will work for you. Your truck should have had a 700R4. BTW, a 700R4 will NOT bolt into place where a TH350 was from the factory! The 700R4's tailshaft is longer and will bottom out on the t-case before you can bolt it together. The tailshaft housing that bolts to your T-case will fit a Th350 and should physically bolt up. Problem is, you wouldn't have enough spline engagement, as the Th350's tailshaft is shorter than the 700R4's. So in a nutshell, you can put a Th350 where a 700R4 was, but not reverse it without building a spacer, swapping out the tailshaft for a custom one or cutting the factory 700R4 tailshaft.