I have a 1998 Tahoe with the 5.7. I had the 4L60E rebuilt around 4 thousand miles ago. I noticed that when I get it up to 80 MPH the transmission kicks out of overdrive, and the RPMS fluctuate based on how much pedal I’m giving it instead of being at a fixed rpm. It will only do this for a few minutes at a time every 15 or so miles. This causes me to have to slow down. I’ve noticed that it only does it at 80 and i haven’t noticed anything at 70 mph. Is there anything I can look at to try and fix this?
Last edited: