I have an 08 Tahoe 4x4 with 16500 miles. It has factory 17 inch wheels and the rear suspension seems loose. I recently put 10 ply tires on and could not control truck, it was all over the place, so bad I took them off. GM says nothing wrong with susp, need help.

 

Welcome to the forum.

Were the tires the same size? Not sure how that would affect it but maybe someone here can help.

 

Yes they were same as factory size, 10 ply Dunlaps.

 

How about tire pressure? Did you increase it significantly?