[travelin texans]

If you have any mechanical ability, a couple jacks/jack stands, assorted tools, this is not a difficult job to do yourself.
But being under warranty I'd be sure it got done by your dealer, axle manufacturer or someone being paid through your warranty along with tire replacements. If you have to go toe to toe with the dealership owner/GM, do it, if that doesn't work keep going up the chain of command.