my wife had a 2002 envoy and it had alot of transmission problems. It had about 30,000 miles on it. The first thing that happened was one day it would not go into reverse. The indicator light didnt move into reverse. It would show up in drive, park, 1 and 2 and i guess 3, I dont remember if it had 3 but it probably did. So we took it to the dealer and they said it was some servo that had gone out and also a linkage. we got it back and it worked ok for a while it still seemed to be having problems but the dealer said it was nothing. later on we were driving it and it sounded like a mack truck so we took it back and said that it is really loud and they tried to tell me that it was the fans running but I knew that was not the problem. Later on in richmond we were driving and we had to accelerated to change lanes and when we did we heard a loud click and the transmission gave out. Once it got back into low rpms it worked but it did not have any power. We were at a stop sign when my wife gave it gas and the transmission made a loud cluck sound and that was it. she rev'd it but nothing happened. I had to get out of the car and push it into a parking lot. As I was pushing it, I noticed that it was leaking alot of tranny fluid. We had it towed to the local dealer and once they saw the record of all the services done they said they would just put a new tranny in. After we got it back it still wasnt running right and we eventually ended up trading it in.