4L80E with Trans Brake, no reverse, line pressure?

[tdmkr496]

Hey guys,

I recently had my 4L80E rebuilt with a trans brake valve body. All forward gears work well but I do not have reverse. The manufacturer of the valve body said that I needed to turn the pressure up in reverse all the way. I did not see a table for just reverse, any suggestions?? I am using COS 5 and a 411 PCM, thanks guys.

[joecar]

There is no table for lin pressure in Reverse (or any gear)...

It sounds to me like the transbrake was installed incorrectly (leaks).

[tdmkr496]

Ok, the trans brake works but only which means there should not be a leak but this is also happening at 210 PSI, I am only seeing 80 in reverse. The manufacturer of the VB said this is common and I just need to increase line pressure in reverse. But if there is no table I do not understand how this is accomplished.

[Lextech]

Are you putting it in Reverse and pressing the trans brake button? That is how they operate. (At least the ones that I have seen.)

Jeff