sbf

At what hp level does the 4l80e have shift problems.I've heard with high hp 1-2 shift will not work

JoeNova

Are we talking bone stock 80e with no shift kit or anything?

sbf

no a built tranny with shift kit,transbrake auto valve body factory ecm controled

dw456post

Whats high hp?

sbf

probably around 1200 flywheel hp.my plans are to build a 408 ported 317 heads fast intake billet s485 or s488

JoeNova

Why do you think that a built 80e would suddenly stop shifting?
I'm pretty confused as to your reasoning.

There are 2000 HP cars running the 80e. The first three gears are basically the same as a TH400.

sbf

i have seen a few threads about the 80e not shifting 1-2 at high horsepower with auto valve body,im just making sure before i build one

Nathaninwa

I had zero issues with any shifts besides my own programming with a D3 valve body and I'm just under 1100whp. Not that I could put that boost through it in first gear, but at 12psi I bet it's easily 700 to 800whp on the 1-2 shift

sbf

why are you taking the 80e out

Nathaninwa

My car isn't the street car that I thought it was going to be. So I'm taking advantage of some weight savings, and the new 1 st gear ratio the glide will give me. I was launch limited on both rpm and boost, if I left with to much it would be wheels up, and if I wasn't shifting by the tree I could hit the rev limiter in first gear