3rd gen Will

iTrader: (8)

So this is kinda weird, well to me anyway, I have a 700R4 out of a 93 LT1 Car, built with a Mega Monster kit according to the person I got it from which I believe to be true. In OD/4 from a dead dig WOT the tranny shifts at 4500ish RPM. Put it in D/3, WOT from a dig it will go to 5800 like it is supposed to. I am simply curious as to why. I assume it has to do with line pressure, I just though it was odd.

89rs454

Odd yes my 4l60e shifts at 5800 in od and in D however i heard it was hard on a trans to run it hard in OD. Just to gun it in drive then slip it OD when necessary.

RBob

iTrader: (1)

The 4L60E shift points are PCM controlled, not so in the 700R4 (4L60).

The line pressure should be the same with the shift selector in the OD or the D position. There may be an internal leak which is causing it to change at the governor. One main difference between the OD and D positions is that in D the over run clutches are engaged.

RBob.

3rd gen Will

iTrader: (8)

A leak, super, would it be in the valve body or in the internals of the trans?

RBob

iTrader: (1)

I have no idea, not familiar enough with how the fluid circuits and seals are. As for a valve body leak easy enough to get two new gaskets and R&R the VB. Be sure to check the old gaskets for push-out or a piece missing prior to puling them off whichever piece they are stuck too.

RBob.

3rd gen Will

iTrader: (8)

Yea I may do that just because, it also does this odd thing when it down shifts from 3-2, it downshifts hard, but upshifting back to 2-3 it kinds lags, the RPMS don't snap down although the shift feels positive. Almost like the band isn't releasing or the clutches aren't applying fast enough, one or the other, I am thinking clutches. Going from 1-2, 2-3 it shifts perfectly though.