4l80e lock up problem

[haakon]

Hi,ive got a problem vith my tranny a 4l80e 99mod.

when cruising in overdrive and meet a hill so the tranny goes out of overdrive it vibrates mutch.
ive also heard it in first gear once at idle,sounded like it engaged the lock up.. if i downshift to third manually,no sound..oil and filter fine..

also when hot,and in reverse,and pushing the gas pedal it sounds like it dies and when off the gas pedal it "gasses" a second and black smoke.. any ideas?

parden my english,im Norwegian:hihi:

 

[WarWagon]

Pull codes. It looks like you have an engine problem rather than a transmission problem. Lack of power can cause a downshift. I would check for codes and look at the waste gate, vacuum pump, solenoid, and vac lines. The black smoke looks like low boost and the vac system is the likely cause.

 

[haakon]

No black smoke driving forward,ever,and runs great..im pretty shure the lock up engages in reverse..

 

[haakon]

could it be the converter clutch? draging when it shouldnt? its worst when hot..

 

[WarWagon]

Get the 1999 to a shop that can read the trouble codes out of the computer. It will tell you if the TCC is dragging or the trans is having issues. Still sounds like a engine problem.

 

[haakon]

the converter started making noise today......getting it replaced next week..

 

[haakon]

It was the converter,i changed it,and nowthe truck runs great!