none at all, they have digressive valving so you don't have to adjust them for different road conditions, etc...and they will damp the rod length w/o a problem.
Remember, the shocks do not provide the lift...just damp the motion, and the shocks for the lift are merely able to extend longer than the stock ones can, as needed.
_________________________
- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif