So... i've had this issue a couple times in the past 2 months. I have an 87 automatic... I went to put my Jeep into gear this morning, put it into reverse, hit the gas... and I didn't go anywhere. The engine just reved up... so I triedputting it into drive, the same thing happend, it didn't move... finally with enough gas it shifted into gear while making kind of a clunking noise below the Jeep. It has happend before generally when it was cold in the morning. It's only happend a few times. I have no clue as to why it's doing this... I need to adjust my TPS but wasn't sure if it was related to this issue. Thanks for any input.