4l60e Transmission Problems

[cbholt]

I have a 93 GMC 2500 2wd with 4L80E transmission. Running down the road in third gear or overdrive, between 2200 and 2400 RPM's, the torque converter locks and un-locks constantly. Doesn't matter if your accelerating or coasting. It will unlock for about a second and then lock back up. and then about 3 seconds later do it again. The computer does NOT throw any codes. Nobody locally seems to be able to figure this out. The Transmission has been rebuilt 5000 miles ago and the Torque Converter Clutch was replaced twice. The assumption I am making is that it is the Torque converter unlocking, and not the transmission slipping. When it unlocks, the rpm's jump about 300 rpms. But it is possible im wrong. Any help would be appreciated.

[alwcurlz]

I have a 93 GMC 2500 2wd with 4L80E transmission. Running down the road in third gear or overdrive, between 2200 and 2400 RPM's, the torque converter locks and un-locks constantly. Doesn't matter if your accelerating or coasting. It will unlock for about a second and then lock back up. and then about 3 seconds later do it again. The computer does NOT throw any codes. Nobody locally seems to be able to figure this out. The Transmission has been rebuilt 5000 miles ago and the Torque Converter Clutch was replaced twice. The assumption I am making is that it is the Torque converter unlocking, and not the transmission slipping. When it unlocks, the rpm's jump about 300 rpms. But it is possible im wrong. Any help would be appreciated.

 

I'd take it back to the transmission shop that rebuilt it and have them fix/remedy that issue! Sounds like it was'nt rebuilt properly.