4x4 issues,

[Dradonday30]

Okay im having an issue with my truck, I'm running 33/12.50 16 Mickey Thompson deegan 38s, 4x4 worked perfect when I put them on about 2 months ago, then when first snow fall came the roads were icy and when I put the truck in 4x4 the steering wheel will jerk left and right rapidly and it gets pretty scary. At first I thought it was the front tires just spinning on ice/snow but I took the truck on dry pavement and it did the same thing. But when I put it back in 2 wheel drive it drives normally. 4 auto and 4x4 is the only time the steering wheel jerks left and right. It's not just a little jerk either. I wanted to see how badly it does it so I went into a dry parking lot and put it in 4x4 gave it some gas and let the truck do its thing, the truck jerked and swerved all over the parking lot. Spilt my coffee, all my homework that was on the dash ended up on the floor. It was crazy. I've recently replaced both wheel bearings, both outer tie rods, took it for a wheel alignment 6 months ago. The only think I've really changed was putting a levelling kit on( shocks, blocks and keys) but the truck did the jerking before the lift so I don't think that has anything to do with the issue. If anybody could help me id really appreciate it. I'll be watching my post as much as I can. Thanks guys. Dradon.
99 gmc 5.3 long box