06 Chevy Suburban 6.0 LTZ AWD Transmission Shifting Problems
The transmission when accelerating, taking off, when shifting from 1- 2, whenever up or down shifts to 2nd, it's like it isn't actually in 2nd, when it is. It just revs up and I either have to feather the pedal or lift off and let it go to 3rd before accelerating again. Also, it won't shift into 4th gear (od). I basically have 1st n 3rd gear working properly. The trans is only a couple years old, a re-man. With about 15,000 miles on it. Could this be the solenoids both need replacement, or could the tps need to be checked or the tcu? I was letting my daughter drive it, until the trans strated acting up. I also removed a Nitro ODBD 2 performance chip from the vehicle that my daughter had been using. The trans fluid is good and fresh. As I have always made sure reg maintenance performed accordingly. Could the Nitro Chip messed up the tcu settings n it will need to be re-programmed ? The VIN # 1GFNK16U26J168284 and it is an AWD model, not 4WD. Thanks for any and all help with this.


