2" lift induced 4WD Wobble issue

[Spoolin]

Hey All,

For you suspension guru's out here... I have a 2" lift on my ZR2.
Wasn't until the temps drops and the lakes froze over and started using AWD and 4Hi mode that I noticed that the front end of the truck wobbles pretty seriously when the front end is unloaded (hard acceleration or towing/hauling heavy loads).

Called a local suspension shop and they said it's a "known GM issue" and to just not use Auto mode.

Feels a lot like the knobby tires are hitting the firewall and everything starts to vibrate / wobble, increasing with intensity the more the front end unloads.

Any thoughts on what to look into? Truck also has extended axles which I wonder if that has something to do with it.

 

[amateurhour]

I’m not a guru, but I do have a few questions: First being is this a 1500? What suspension lift was used? Does it have strut spacers, collars, or something else? Why extended axles? More extended than factory trailers boss/zr2?

 

[ZR2BIZON]

I have a 2" lift over stock and have no wobles. It's a peak kit. Nothing on 4hi or 4lo. Everything else on the truck is stock and I removed the sway-bar