Turbo 400-harsh reverse engagement

[Steve]

I have a turbo 400 in my 67 Firebird/LC2 hybrid and the trans works great but when I shift from drive to reverse the engagement is pretty harsh. Its not so bad I can't live with it but it would be nice to be a little softer. When I back it out of my shop its not too bad but after I drive it some and go to back up the engagement is noticibly harder. The trans is built like a "normal" upgraded turbo 400. It has a 3400 stall, Red Alto clutches, 34 elemement sprag, Trans Go shift kit and some upgraded 4l80 parts(I am not a builder so I am not sure what all 4l80 parts). Thanks for the advice.

 

[chris718]

Install a .250 cup plug in the rear servo feed passage in the case and drill it out to .065".Nice easy apply without the bang.YouTube - ?????? ????????? SPIROS ZAGORAIOS - TON XARO TON ANTAMOSAN

 

[Steve]

Thanks!

 

[85ha]

You can also use a 2nd accumulator piston from a 97-up 4l80e. It has relief notches to prevent oil being trapped behind rev servo causing your prob

 

[ljo]

Is the feed hole the one towards the front of the trans, near the rear servo?