Noises During Shifting problems of the 2006 GMC Sierra 1500

The contact owns a 2006 GMC Sierra 1500. While driving various speeds, the vehicle made a loud clunking noise when the accelerator pedal was depressed. In addition, the vehicle shifted hard when switching gears. An independent mechanic diagnosed that the valve body inside the transmission was defective. The vehicle was not repaired. GMC of plattsburgh, new york (518)-563-2000 was made aware of the failure and stated that there was no recall on the vehicle. The manufacturer was made aware of the issue and provided the contact with case number: 8-3309303524. The failure mileage was approximately 20,000.

When the transmission shifts from 2nd to 3rd there is a hard clunking, also when it down shifts from 3rd to 2nd. I have had this 2006 GMC for only 10 months and I purchased it new. I took it to my local dealer for the problem and they told me that this is normal noise for a four wheel drive. I have had many 4x4 gms in the past and not one of them has had this kind of a shifting problem. I have purchased three new gm's in the last 4 years and I have had problems with all of them, I think I'm going to trade it in for a Toyota.