slow67

iTrader: (2)

Th400's and 80Es are known to have harsh reverse engagement. As stated its probably a high idle issue. A couple hundred rpm difference could be a difference of 100psi line pressure to 300 psi line pressure (this is normal and intentional for reverse in an 80E).

Atomic

iTrader: (42)

I have another similiar issue...the trans is very difficult to turn in reverse, by hand or backing up. So much so that the truck has a hard time keeping a steady idle if I back up, as soon as I shift to neutral or drive its fine.

chevyrace47

iTrader: (2)

is it under warranty?

Daryn

iTrader: (19)

mine does it too... i have a stock converter though. im not worried about it.. im worried how long it will last behind 800 hp though

Vince B

iTrader: (1)

When you try to turn the output it will turn with more resistance in one direction and this is reverse. So this is normal. In most cases with a stall your idle will have to be increased for reverse and its pretty common complaint that the engine wants do die. I have seen this complaint many times with a 60 so IMO you have the same thing going on with your 80. Vince

Atomic

iTrader: (42)

Ok...I never noticed it with my 60s or my built 80e with the same current torque converter, just this rebuilt 80e.

GMCtrk

iTrader: (27)

I don't have the harsh engagement, but on a cold start if I don't wait for the rpms to come down shifting into drive the rpms will transiently shoot up to like 1300.

Escalarado

iTrader: (3)

Is there any harshness when shifting into drive under the same conditions as shifting from park to reverse?

Atomic

iTrader: (42)

Nope. Its a firm apply, but not nearly as violent. I let blake and mitch hear it apply to reverse at the meet and both of them were kind of shocked it was so violent.