Hey I saw that there are some older threads on this issue, although it doesn't seem to be quite like my situation. Brand new transmission 300 miles ago, heavy duty towing transmission that still shifts and drives great. However last week the truck started to die every other time when put into reverse, warm and cold. It now does it every once in awhile in drive as well. The reverse lights sometimes come on sometimes they don't. Full synthetic ATF, fluid is topped and clean. No drips, ipr is tight with tin nut secure. Transmission has plate tranny cooler, unloaded it doesn't get over 165 F usually runs at 140 F. Has hydra motor tunes that exclude the transmission line pressure increase, shifts at normal pressure. This truck feels like it's cursed, please send help.

 

Just a shot in the dark, have you checked your shifter lever wiring? From what I can remember, the wiring would get chaffed and short..

 

Did you replace the torque converter? If so what kind?

 

I gave up on it and took it to my mechanic, he seemed to think it was the tranny filter but who knows, the transmission is under warranty so hopefully it all works out.

 

I'm not sure what brand, i didn't even ask all the specs on transmission but I saw that it a polished TC supposed to be heavy duty.

 

A polished torque converter? I've never heard of that. Can you tell me more about it?

 

To be honest I don't know much other than it's a TC that isn't supposed to slip to try and grab a higher gear, especially when towing. You can really feel a positive lock up when it shifts, especially into 3rd

 

The torque converter has nothing to do with gear selection. It cannot make the trans grab a higher gear.