SeaComms right-and the loss of + caster isn't that great on a 2.5½ lift, but
It will make the cornering and hiwy driving a little "flighty", it can be fixed, but doesn't cause the "WOBBLE"-
One of the main causes of the Death Wobble after lift is, guys either loosen, or change track bars and then don't reinstall them in the CORRECT manner-
If you install bigger tires, that increases your toe-in and that can add to the wobble syndrome !!
It's never simple !