From what I have seen on their website their upper and lower control arms are both adjustable and have johnny joints in them. Looks like a pretty good deal with full leaf packs for the rear and ect...heres what their site says
XJ 4" Ultra-Flex Articulating Lift Kit http://www.tomken.com/
For XJ models with Dana 35 rear
Set your jeep up so you can put on 31x10.50 tires. This lift has stood the test of time.
Rear leafs (pr)
Sway bar mounts
Rear bump stop ext.
Poly leaf bushing
Rear brake line ext
Adjustable articulating control arms
(Uppers and Lowers)
Set of 4 U-bolts
1" trans case drop
Lower adjustable arms w/ johnny joints
This pic does not show all of the parts but most....
WHAT DO YALL THINK???? Looks like better control arms than come with the RE kit...but I dont know much. All I know is if everyone did what everyone else did than no-one would discover newer better stuff....so I want to make sure that RE is not the ONLY alternative to trash.