Most 3" lifts only come with lower adjustable control arms. If so, you really need upper adjustable control arms to adjust the pinion angles to where they should be at 4" or higher. There are some guys that have gotton away with stock uppers & 4" to 5" but it will sooner or later trash the pinion bearings if you can't get the angles right. Allso you'd most likely end up with bad vibes.
ZJ 98 5.9 LTD. Lots of mods. 7" T&T's Long Arm Lift ,BFG KM2"s,35X12.50x16's,4:56's, Vanco brake upgrade, M1intake,Holley52mmTB,MikeLeach Headers,, Arb'ed HP D30,Aussie Locked rear,Procomp MX6 Shocks,Arb front,RearTR bumpers,ECT.ECT.