Four problems related to differential unit have been reported for the 2004 GMC Envoy. The most recently reported issues are listed below.
The gears in the front differential got damaged at 41,000 miles. Had to replace the gears.
The contact owns a 2004 GMC Envoy. While making a turn at 40 mph, the contact heard a loud boom and a grinding noise. She had the vehicle towed to her mechanic and then to the dealer. The dealer stated that the front driver side differential casing was cracked. The purchase date was unknown. The current and failure mileages were 71,838.
The contact owns a 2004 GMC Envoy. While driving 55 mph, the driver heard a loud noise in the front of the vehicle. The gear shifts from normal to 4 wheel drive. The dealer informed the contact that the front differential was cracked and needed to be replaced. The vehicle was diagnosed for a second opinion and the mechanic agreed with the previous failure including that there was no oil in the differential. The contact stated that she has filed a complaint## 71-492693494 with the manufacturer. The contact can provide photos if needed. The dealer advised the contact the vehicle can be repaired for a fee. The current and failure mileage were 55453.
While driving at 35-40 mph, after exiting the highway, (I-75) my truck just slowed all of a sudden, almost to a complete stop, no warning. And started jerking. I was almost rear ended. My truck started rattling, and clanking, and I had to have it towed. I was told by the dealership that my front carrier had thrown a bearing, (font differential) and the housing was broken. I was also told that it would be 3,286. 53 to have my truck repaired. Upon further research, I learned from a friend that the same problem had occurred with his truck six months after he had purchased it, and that over 450 of these same parts had to be ordered in 2004 alone.