Hi! I'm new to this, but I have a question that I hope someone can help me with. a year and half ago I bought a 1988 Jimmy 6.2 Deisel. I got the truck cheap, and am now having problems with the tranny. The guy I bought it from towed a huge boat, and has has the tranny rebuilt. Even from when I got the truck it was slow to go into reverse, you had to wait a few seconds and then you would hear a "clunck" and the truck would be in reverse. Now the truck won't go into reverse without using the gas peddle, it still clunks. It will not back up a hill at all. you almost have to be going downhill to get it to work. I was in 4wheel drive when it broke. My husband also did tow a large dodge truck while in overdrive. my other thought was that I had been using the cruise control, could it be the throttle valvle? Any Ideas?