Vibration in drivetrain at speeds less than 45mph. Engine only runs 1,000-1,100 RPM's at speeds less than 45mph. Transmission shifts into 3rd at approx. 20mph and 4th at approx. 30mph. Engine feels like it is struggling at speeds less than 50mph. Two different dealerships stated there was a problem, but said that everything was electronic and nothing could be adjusted. A/C is not cooling sufficiently. It only cools on full cool with re-circulation and fan on high. Even then, air coming directly from center vent does not get below 48 degrees. I tested two other vehicles and both blew 40 and 42 degrees from center vent. Two different dealerships admitted there was a problem, but stated there was no fix. Driver-side outside mirror vibrates. Dealer replaced twice and both manufacurer and dealer refuse to replace again. Weather stripping along ouside bottom of both driver and passenger windows is defective. Dealer and manufacturer both refused to correct problem because other stock units look the same.

- Orlando, FL, USA

Drive train vibration problem is getting worse

- Maple Shade, NJ, USA

Front ends shakes at 64mph/vibration in rear when you take off. Air sound when you press brakes. Jerks when you get to about 10mph. Been in shop 4 times with no repairs made at all.

- Houston, TX, USA

Transmission is shifting hard when shifting from first to second gear while driving in low speed. Dealer can't determine the problem.

- Del Ray, FL, USA

Transmission shifting hard form 1st to 2nd. Dealer replaced transmission assembly. New transmission shifted hard. Dealer reprogrammed truck. One week later, transmission started vibrating in 1st and 2nd gears. Dealer reprogrammed truck again. Now transmission not engaging in first gear untill RPM's are at or above 1500.

- Monroe, LA, USA

Other equipment; severe vibration that feels like body flexes between 65-75mph. I have slowed and pulled off onto the should fearing personal saftey. I have brought it to 2 dealerships for a total of 5 times, and spoken with GM customer service, as well as written a letter to Chevrolet. They claim that it is a new "charateristic" of this year, no fix. Powertrain:transmission:automatic - it shifts into overdrive at about 37 mph producing a growling sound, brought to two dealerships for a total of 5 times, no fix. Other equipment - clunk noise from front.

- Huntsville, AL, USA

Since date of purchase, transmission has been vibrating and causing engine to feel like it is under stress/heavy load. Contacted dealer and another chev. Serv. Both advise chev. Knows of problem but does not know what it is or how to correct it. Contacted chev. Cust.serv. Total waste of time. They do not care. Simply state if chev. Tac says they are working on problem what do I care. They will fix it eventually. Problem is if they dont know what the problem is how can chev. Claim it is not a safety issue. Second problem- ABS brakes are activating on dry hard surface at speeds under 40 mph. Dealer syays problem does not exist. Stated they called chev. Tac know nothing about break problems so there must not be one. Tried to say that I dont know how ABS works. Have had ABS for 15 years know it pretty well. It is definitely activating when is should not. It seems that chev. Is not concerned becasue truck was bought and paid for.

- Voorhees Twp, NJ, USA