I recently just heard that you can to, when someone asked me if they could. I just found out from Windrock you can, even though Tera does not mention it on thier site. Would be interesting to find out how they do on the XJ.
A cheap mod is to use a stock shackle with an MJ or 1 1/2 lift shackle, lots of droop that way, but Detour is right about re-inforcing the spring hangers I think.....(judging from the way mine look) ;-)
Considering what I have to do, (reinforcing, brake lines, e-brake cable, etc). I have decided this is not something I want to do right now. I'll just put the money toward my locked d44. Thanks!