2012 Sierra randomly jerking during hard braking or acceleration

[Jason Jay]

I have been looking and have seen several post describing a similar issue but have not seen any resolution.

 

My 2012 Sierra just started jerking either left or right randomly. The more I drove it I realized the steering wheel was also cocked a few degrees of center...then after a "Jerking episode" the steering wheel would be cocked off center but to the other direction.

 

7 weeks ago I put in 2" spacers to level the truck. In the process I had to replace both upper control arms. I took the truck in for an alignment and they replaced the ball joints on the lower control arms. Now $800 later and maybe 300 miles my truck is jerking left during hard braking or right during acceleration. When I say jerk I mean puts me in the other lane or almost off the shoulder. The only other time it jerked was when I hit the first set of rumble strips coming to a stop sign (before I began to brake)....almost like something jostled and caused the same jerk that put me well over the center line. At this point it is not being driven until I get it looked at or fixed.

 

Checking to see if anyone has ideas or a known cause so I can get to the root of the problem right away rather than have a shop guess and come away only with hundreds of dollars spent with no solution. This is my weekend vehicle for the most part so it hasn't been used a lot since the alignment and surely hasn't been abused.