700r4 question

[nak4af]

The sun shells are different between the 2...

I just called transmissionpartsusa.com and they stated the internals are the same between the two cases. Absolutly no differences. Not sure what you are saying but these guys sell a ton of parts for these things. Just going by what I've ben told by those who build and sell.

 

[90ranajo]

My info comes from the late Steve at Bowtie Overdrives. I'm pretty sure its the sun shell, but it could have been the forward drum (as there is a 27 spline & a 30 spline).

 

[nak4af]

My info comes from the late Steve at Bowtie Overdrives. I'm pretty sure its the sun shell, but it could have been the forward drum (as there is a 27 spline & a 30 spline).

You are right, the spline count changed at a certian year. It was changed in '84 for the V8. The following is copied from Wiki;



The original version of the transmission had a 27 spline input shaft which was a common failure point. In 1984, 700R4s designed for use behind Chevrolet small block V8s received a 30 spline input shaft which used a different torque converter than its 2.8 V6 and 2.2 L4 powerplants. Between 1984 - 1987, internal components, from the ring gear to the oil pump housing, were updated, ending with the auxiliary valve body (for 700s manufactured after October 1986).