im running a 2000 tj with a 4.5 Rubicon Express on 33's
that said, 6 inch with a SYE and a 1 inch body lift should run 37's but u need to do a axle upgrade and work on your steering, ie a drop pitman and a upgrade
also u will need to do a job on the rear drive shaft and USE DSI, ( personally will NEVER use PATS again) sorry to anyone who disagrees got treated like crap there
then going that high u will need to do some engine, transmission and tranfer case drop/angle adjustment .
im Totally new to this but talking to the VAST amount of expersinse here and my own reading this is what i think
anyone whos knows better please advise these fellows and me as well cause i love to learn
thanks and cheers
J