Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
I'd definitely do frame stiffeners front to back if you wheel hard. Tie in your box steel rockers to the frame rails somewhere near A- and C- pillar areas. Also make sure you do something about the leaf spring mounts you mentioned. I suppose you're running long arms, so front LCA and UCA mounts on the uniframe aren't an issue.
IMO, there's no need to go overkill with the stiffeners; some use 1/4" L-section which is.. ..well.. retardedly heavy and unnecessary in most cases. When I had my XJs, there were multiple places where the unibody/ uniframe started to crack after only a couple years of wheeling. Good front & rear bumpers, box steel rockers and exo-cage do help, but they're not enough for hard trail use.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***