I have a 99 2wd single cab short wheel base with a 4.2 with a three inch body lift...i am ordering fabtech's 3 1/2 inch spindle kit with a daystar spring spacer...do i have to get longer shocks than the ones that come with the fabtech kit because of the daystar spacer??...i have put a spacer on a 2wd b4 and it required longer shocks than the factory ones...

 

with the spindles you should not need new shocks, i am not sure about the spacer though. Best thing to do is call Daystar and ask what they suggest

 

You should be fine.