Try Rocky Mountain Suspensions
Also, since you have a 4.0, you'll have the D35 in front.......the Rough Country passenger beam bracket is known to punch a hole in the aluminum diff housing. That won't happen with a D28 cause it's smaller in size. Tuff Country or Skyjacker has a passenger beam bracket that's designed NOT
to put a hole in the D35 housing. Thought ya might wanna know.
A 4" lift with 33's will rub a little unless you trim the lower corners of the wheel openings on a Gen1 & Gen2. A 6" lift will clear without trimming. If you're not opposed to a little trimming & you'll never go with bigger tires later on down the road, go with the 4".
P.S.-- Skyjacker makes the strongest/best TTB brackets out there for name brand lift kits. It costs more but worth it. I've repaired (welded & gusseted for strength) drivers beam brackets from Superlift & Trailmaster because they cracked and/or broke.