I've noticed a vibration, while driving down the road. Not bad, but there. I checked my rear differential and noticed that the seal is leaking in front, where the U-joint connects. I've got 64k on my Libby - could my Frankenlift have caused this? (I've put about 12k on since lifting) Also, do I have a prayer of getting it covered under warranty? (Translation: I got laid off 5 weeks ago, and am in 'defensive mode', when it comes to spending cash )

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E.E.P. for my Jeep (EMPTYING EVERY POCKET)
2004 Limited - Stock no more
JcrOffroad sliders-Trail tested, mud approved
Frankenlifted
Al's A-Arms
Stock Skids
235/70/16 Cooper Discoverer HTPs

If you have something leaking it is not a U Joint but the rear seal, if its bad and leaking a lot then it will need replaced.
If you have a vibration from there it could be a U Joint bad , mine ( rear one) went at 52000 or so I think it was. Caused a really bad vibe in time.
Lift would not of caused this some may say it put extra stress on the joint but we can not lift them enough to really put that much extra on them in any way IMHO
Jack it up and check the rear joints really good, mine still felt tight....cause they were, they had no lube left and were basically frozen solid

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited