Problems with 2011 GMC Terrain POWER TRAIN

Vehicle has been in dealers service on several occasions complaining about the jerky transmission in first/second change. when changing in the low range transmission hits real hard and jerky particularly if pulling away from a stop at a moderate speed. service department told me it would smooth out after break in period. dealer claims transmission is operating normal and due to it being a 6 speed causes this. hard to believe gm cannot fix to have a smooth operation. vehicle now has over 10,000 miles and still has the same jerky transmission at low speed. *tr

Vehicle continues to be checked with dealer for awfully jerky, hard hitting transmission when changing mostly in low range gears. service department continues to say transmission operating normal? vehicle has over 17,000 miles on it and continues to be plagued with jerky transmission periodically. hard to believe there has not been a service bulletin on this problem? *tr

Transmission slipping/jerking on my gmc terrain suv-sle model. i have taken it to the dealer 2times for the same problem. they say there's nothing wrong, but it's still jerking, it's happen when the gear shifting (it's an automatic) the change over is not smooth. the mechanic says it's doesn't happen when they drive it of course, but this does negate the fact that it is happening. please have someone check into this problem. because i'm sure it's happening to other terrain owners. *tr

Tl*the contact owns a 2011 gmc terrain. while driving approximately 15 mph and shifting from first to second gear the vehicle jerked. the vehicle was taken to the dealer twice and the technician performed updates to the electrical system. the vehicle continued to lunge after the updates. the approximate failure mileage was 800.