The key is to maintain the tracbar to steering arm relationship (must be parallel) two ways to fix. If the lift uses a elevated axel mount to reuse the original tracbar the bar will no longer be parellel and even a 2 inch BB will cause a little bumpsteer
(especially when one wheel dips or rises on one side only) The best fix is to install a ADJUSTABLE tracbar using the original axle bracket. (throw out the supplied raised bracket) The other fix is to use a dropped pitman arm as discussed in this thread.