You can always swap gears from earlier 3.5L XLS which will give you 4.9 instead of 4.3 you have on 3.8L.

And I'll second on tire size. See sig


92 SR, 285/75R16 Yoko MT ARB locker GAST compressor AirLift 1000 MM10500 Snorkel custom rear bumper
02 Montero LS died protecting the master
08 PowerWagon (stock!)