swilson143

I was experimenting with the issue on my commute home. I found that (at least on level ground) the issue occurs only between 72-75mph. Once I exceeded 75 the TC locks up and behaves normally again I wonder if the TPS could have a bad spot in it that would cause the tranny to get a bad reading and not know the throttle position. Maybe that would cause it to think I was off the throttle for a sec and take the TC out of lockup? Sent from my Pixel 4 using Tapatalk

Anyone come up with a solution for this? I have a 1991 Suburban v2500 with 4L80E. At around 75 mph the torque converter begins to lock and unlock every couple seconds. If I drop my speed back below 70 it stays locked again Sent from my Pixel 4 using Tapatalk