Originally Posted by
john8662
What's the build month?
1992 was the first year for the 4L60E tranny, so that's why the commotion.
Look behind your aircleaner on the driver's side rear for the TV cable, if you've got a cable that runs down to the transmission, then it's a 700R4.
If it's 700 with the flare, something come to mind, maybe it's not shifting from gear to gear, but what you're feeling is the torque converter locking and unlocking. This would point towards the TPS as well.
As for the idle, the open exhaust won't have anything to do with that, but it will shake more in the cab if the exhaust is touching something, etc.
Wish you well!
Oh yeah, welcome to the page!!!