after days of searching trying to figure out what springs i bought i finnaly with the help of matt at 4wd.com and the great people at pro comp found out i have a 4" front and 2" rear coil lift from pro comp. now the question is would i be stupid to install a 4" front lift on a 08 unlimited rubicon with a heavy steel front bumper? my thinking is between the extra weight up front and the natural lower front angle of the rubi it should sit level at around a 3" front lift. the issue is i am not at the point cash wise to install a front driveshaft, would the extra weight make it possible to run stock shafts without definate failure? thanks

 

Somebody else chime in here cause I don't know for sure that I'm right, but here goes:
The way I understand this, is that 4" is the magic number with the JK unlimited. 4" and higher and you'll need a new shaft, (no pun intended), under that and you SHOULD be okay. I say should because, as it was explained to me, that 3" you can get away with UNTIL you get into serious articulation. If you start to articulate and use heavy torque, you'll end up with a two-piece shaft. (and I hear those are crappy )

Hope that helps, probably not, but hope so.

PS can't say fo sho, but with my skyjacker lift and a steel bumper, my three inch lift is a bit more like two in the front. So your theory, in theory, is correct.