Transmission Stuck In Gear Problems of GMC Envoy

First problem occurred in 2008, driving to work in 2003 GMC Envoy slt (original owner) heard clunking noise when downshifting. Took car in to shop for repair (just over 50k miles so out of warranty). Shop explained that the transmission needed to be replaced $4000 with one year warranty. Since I was planning on driving cross country decided to do the repair. One year later, driving and trying to accelerate on a ramp to find SUV stuck in second gear and wouldn't accelerate while rpm kept going up. Also heard clunking when downshifting. Pulled over and tried to get gears to shift by slowing down and speeding up (to get rpm to drop). Drove car to dealer who stated I needed a new transmission (again). Dealer removed transmission and "found input bushing in pump bad. And reverse drum. And had heavy metal contamination". When asked why this is my third transmission in six years the service agent said "bad luck". Both replacement transmissions were rebuilds. The current transmission is not under warranty.

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When I first bought the vehicle the transmission was shifting eratiecly for a while. I took vehicle to dealer, and they said nothing was wrong drive it until it breaks. 3 months and about 3,000 miles later I had not had another problem. Until I pulled up to a stop sign at a busy intersection. I checked for trafic and went to pull out except that the Envoy would barely move. It was like the brakes were on or something was holding the vehicle back from moving. The cross traffic was quickly approaching and I had no choice but to slam on my brakes and hope the other person didnt hit me as I was sticking out in the intersection. The other person swerved and missed me. I pushed down on the accelerator again and slowly rolled through the intersection. I stopped on the other side of the intersection and tried to start again. The same result of no acceleration as the car slowly began rolling and continued to accelerate to a normal speed but at much higher rpm. I took it to the dealer and they said that is was stuck in second gear. Park and reverse also worked but none of the other forward gears worked manual shifting the transmission or setting at any other drive position. They said they fixed it because of a service bulltin put out by gm. They told me they fixed a wiring harness, replaced the ignition switch and cleared all the codes.

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