I have 5100s on the second perch with Toytec 3" lift coils, 9 wrap rear springs with a 1" body lift. No cutting or trimming to fit. I can turn tight af too.
If you're wondering about what transmissions work with what year it's pretty simple. The valvebody in the A340 is different 96-98, 99-00, and 01-02. While you probably could get a 96-00 working the 01-02 A340 is electronically controlled and the valvebody is completely different and a 01-02 will...
I'll add to this that I bent the opening of the muffler down some to fit and welded it there, no leaks. I have the XR1, while I enjoy the sound it is pretty loud, it would be better suited to a V8 4th gen.
LBJ is one of those OEM only parts. MOOG is junk, anything else you get at the parts store is junk. It's expensive to go OEM, but at least it'll hold up.
I run 35x12.50s with 3.73s. Is it retarded? Sure, but the only adverse effect I have is acceleration and fuel economy and I didn't buy my truck for either. I daily mine and it rides just as good as it did with 33s, that being said I do wish I had 4.88s.