ahh the warranty debate... It does seem hit or miss with the Jeeps. I mean the dealer warrantied MikeD front axle while he had 35" tires mounted... some forums online say the dealers wont warranty axle breaks if you are running larger than the factory 32" rubicon tires.
My best dealing was with my Tiburon. Took it in for something electrical in the cabin... wanna say the AC controls. When I picked it up there was a note from the service manager that said, "Nice car, but your warranty is pretty much voided except stuff inside the cabin on the car." I guess a supercharger with the supporting mods, clutch, and limited slip will do that to you {toast}