There is a problem with transmission. Vehicle has trouble moving at times. Also, a loud noise comes from transimission when consumer is driving. Contacted dealer, and dealer was not willing to do anything.

- Bellingham, WA, USA

While driving and without warning automatic transmission is shifting gears, stalling results, and vehicle stops.

- Arcadia, IA, USA

Vehicle accelerates from a stop, at times, vehicle jumps from drive into neutral. This problem occurs when the vehicle is cold. Dealer has been contacted. Consumer states that can be dangerous in traffic or with a load on hills.

- Durango, CO, USA

Truck sat idle for 4 days. Started truck and tried to put it into reverse several times. Transmission wouldn't shift. Had to start truck several times before shifting took place. Chevrolet dealer says allison is aware of the problem and attempting to find a fix. Allison has not advised us or the dealer of this problem!

- Selma, OR, USA

When putting vehicle into any gear it will move no where. This is an intermittent problem. Contacted dealer.

- Mt. Harry, MD, USA

Tires "cupped" before 8000 mile rotation, transmission- feels like clutch is slipping, has times in nuetral from a stop then slams into gear... motor sounds like a diesel at start up quiets some, yet all this is suppose to be "normal". (tiresize: 235/75/R16)

- Copake, NY, USA

I purchased my vehicle and 1 week after purchase the engine began making a knocking noise which proceeded to get louder. I phoned my dealership and they made an appt to bring in the vehicle for inspection. I was told at that time that the vortec engine made that sound and there was nothing they could do. I disagreed as it didnt knock when I purchased it. They did a top engine clean and returned the vehicle. I drove it to Wyoming and the same day I picked it up it was knocking and missing. I phoned the dealership and they said to bring it in when I got home and gave me GM cares number in case it broke down. I took the vehicle back in and they have now had it for 16 days. Nothing has been done to repair it. I phoned GM they said 1 out of 4 vortec engines have this problem..they have no fix for it but I should get at least 36 thousand miles from the engine. I told them that was not acceptable I paid 28 thousand dollars for the truck and was told I should get at least 200 thousand miles on the engine. They were aware of this problem before I purchased the vehicle but never disclosed this to me. The transmission is also spinning in gear. I was at a stoplight and at the green light accelerated but the transmission spun then jumped into gear and almost threw the truck into the vehicle in front of me. Also towing my horse trailer the transmission doesnt shift properly.

- Shingle Springs, CA, USA

After only having this new truck for 2 days the transmission was taken out of it due to a ticking noise in the engine. The mechanic was advised by GM to take out the transmission and replace a flywheel. After 2 weeks of waiting for a part I picked up my truck. The next day the noise was back. I have had 2 GM reps listen to the noise. The secound rep told me that it was "entrained gasses" and that there was nothing they could do about it. I did not purchase this truck making the noise and do not want it anymore after the transmission has been taken out.

- Mount Airy, MD, USA

Transmission shifts from 5th to 3rd, over revving the engine, also it will for no reason shift all the way down to second gear at interstate speeds nearly causing an accident.

- Bismarck, ND, USA

Transmission shifts from 5th to 3rd, over revving the engine, also it will for no reason shift all the way down to second gear at interstate speeds nearly causing an accident.

- Bismarck, ND, USA

On a slight incline vehicle will roll backward and hesitate when accelerating. Dealer has been notified, and said that this was normal operation for this particular transmission. Consumer stated, vehicle will hesitate on flat ground. When trying to get on hwy or exits this can be very dangerous.

- Portland, OR, USA

Transmission seemed to be in neutral after stopping and applying brake then accelerating. Dealer picked up with wrecker. When wrecker arrived, condition could not be duplicated. Dealer has valve body ordered to replace in transmission. Second problem: Rear leaf springs shift causeing a knock when going up uneven grades or speed bumps. Third problem: Looseness in transfer case and rear axle cause a clunk when downshifting to stop and sometimes when transmission shifts. Dealer claims normal. Large aluminum driveshaft transfer sound. Just excuse for poor quality product. This clunk or knock also sounds when rear axle moves on uneven grade with axle shifting and driveshaft stationary.

- Adairsville, GA, USA

Engine stalled without prior warning in stop and go traffic, and engine misfired several time daily. Also, transmission clunked on straight away, a torque converter lock up. Dealership was aware of problem.. vehicle was there for four times, vehicle is there currently.

- Santa Rosa, CA, USA

Automatic transmission violently jumps while changing from first to second gears. Dealership has examined vehicle, but has not informed consumer as to cause or reason of problem.

- Miles, IA, USA

The problem is an intermittant neutral condition. This happens when stopped at a light for a few minutes. After releasing the brakes and applying the accelerator the engine revs, but the vehicle does not move. Then all of a sudden the transmission engages with a large bang and the rear tires break traction. This has happened six times. The dealer says there is no problem. The manufacture says they have had many calls for the same problem, however they don't have a fix. On the internet, there are several people that have had this problem and GM has fixed it with a new valve body for the transmission, as well as, a new front pump assembly. I feel that this is unsafe and should be fixed. Thank you.

- Milpitas, CA, USA

Consumer had bought vehicle brand new. Could be driving and transmission would be jumping out of gear. Had to be taken back to dealer for transmission problem. It was determined that the valve body was defective and was repaired.

- Columbia, IL, USA