Ok guys I have a 1999 silverado 5.3 4x4 with 2.5 roughcountry suspension lift. Two weeks ago we had a lil bit of snow so I took my truck out to drive around town. I started to notice whenever my truck was in 4auto or 4hi the steering was super loose (wobbly) and I would have to keep my hands on the wheel 24/7 otherwise the truck would dart to one side or the other. At first I thought it may have been the snow or ice ruts but I just confirmed yesterday (on dry ground) that it is still doing the same thing. Once I place it back in 2wd all the loose steering goes away and it drives fine. I've inspected my cv axels and the rest of the front end components. I still have yet to get the truck up in the air and start messing with stuff but I figure I might reach out here to find some answers.

 

could be tires not matching or gears not matching. what it sounds like is the rear is pushing the front just a little. not really saying i know this might be your problem but i would check those numbers out while youre waiting for someone to give a better answer

 

what kind of lift kit?...torsion bar keys?
did you have the truck aligned after the lift kit was installed? if the alignment is ok...its possible the lift kit has the cv axles angles cranked to high