Jack Clements
Newbie
I have a 1998 chevy suburban 4x4, 5.7 vortec, 4l60e with about 150k. Ever since I got the truck with 148k it has never shifted from 1st to 2nd at WOT. As well as it not shifting when on the floor it gets up to about 3500, stays there and backfires and pops. Its kind of like it hits a rev limiter. When not on the floor the truck runs flawlessy and when it park it will run up to 5k with no problem. It doesnt seem as if the trans is slipping because it will not get past 3500 its like something is holding the motor back. Any help will be greatly appreciated. Thank you!