Whenever installing a lift and changing the ride height, the trackbar bolts and control arm bolts should be loosened.
Then, with the full weight of the vehicle on the ground, the vehicle should be vigorously rocked forward and back and side to side to ensure the control arm and trackbar bushings are not bound/pinched/preloaded at a different ride height than the new one.
Then, the bolts should be all re-torqued to spec.
The trackbar and lower control arm bolts are 125 ft lbs.
Here is a link to a torque specs thread:
As far as maintenance goes, the trackbar and control arm bolts should be re-torqued to spec at every oil change interval and after every series of vigorous offroading trips. Bolts have a way of working themselves loose as the suspension cycles.
Loose bolts result in wobbles--including Death Wobble--and wallow/oval out bracket holes, or worse, result in leverage that rips off axle side trackbar brackets from their welds.