I thought about converting my XJ to a 4cyl.... 4BT Cummins turbo diesel 4cyl... LOL... Either way I run 3.55's on my XJ with the AW4 and 33's... it isn't too bad really... but am thinking of hitting up some 4.10's ro even 4.56's as I am needing to replace my front pinion seal anyways.. maybe get a little bit of MPG out of it... can never hurt I guess... LOL