the Envoy was cold and i started it up and waited about 2 min and put it in gear hit the gas and the transmission slipped but only when I burn out. Than I notice that when I am driving and had to slow down and than accelerate I would hear a noise coming from under the car. Today i was reading about this problem and they said to start the suv and put it in gear and hit the gas and when I did this a couple of times it slipped one or two times and one time the rear driver side wheel kinda felt i the tire was flat or the axle was broke. I put it in reverse went back a few feet and put it in drive and it was fine. Is the trans going out or the rear end or drive tran. I will be driving it 1000 mile next week so I need to know if there is something wrong. Am I hurting the suv by doing these test ? When I start out normal it shifts to second kinda rough but it drives good until I slow down and hit the gas and than i hear that noise but not all the time.
