i would say redoing the panhard rod to recenter the axle would be a good idea with even just the 40mm lift.

or you could always buy the 4" lift (100 mm approx) off of me, and it will come with the adjustable panhard bar!!!

2000 SPORTY, DEF BOY customs, mmm....lockers, mmm... gears, mmm... double transfer case, mmm... stroker