Three problems related to automatic transmission have been reported for the 2005 Chevrolet Avalanche. The most recently reported issues are listed below.
At highway speed, service 4 wd light came on, stated vehicle lost speed/power and the 4 wd selector shifted on its own into 4 wd hi. . . . . Very dangerous situation. . . To lose speed and power in highway traffic.
I bought a 2005 chevy Avalanche. 3 year 36,000 mile warranty, at 40,000 miles the transmission disintegrated. $3,000 out of pocket. . . . . . . . I expect a little more than 40,000 miles out of a $35,000 truck. Now I'm getting mail about a speedometer lawsuit, I've always been a chevy guy but if this is what I can expect from gm maybe its time for a change!.
Car started jerking as if it was going to cut off then once I got on the highway it would not go over 50 miles per hour. Took car to the dealership, and later found out that transmission was gone.