Hey everyone. I have a 1995 c1500 and the issue I am having is when I’m cruising at light throttle the transmission constantly downshifts and up shifts. I replaced the tps sensor a few years ago but could it possible be that or is the transmission acting up? Thank you for any help.
Probably not the issue.
But, torque converter lockup actually runs through your brake light switch on a 4l60e.
Make sure your brake ligjts are working correctly.
I had a short in mine that would kick it out when they got wet or if I stood on the brake pedal.
I only figurred it out because I put new taillight bulbs in and backed the truck up so the ass end was pointing towards the glass windows at Oreillys and when I hit the brakes the taillights flickerred and went out but came back on when I let off a little bit.
It was bad grounds at the tail and a bad brake switch