As Gareth said, 3.9 step-off and matching rear diff is the way to go, try Bernie (Gearboxman).
FAO Gareth..............explain please: 
Originally Posted by GARETH T
..........another way of going better
acculation and is too change your rear diff too a 3.9:1 diff,, and change the ste-off gears in the transfer box
........microscopic organisms do most of the work; the
acculation of organic mater forms HUMUS; roots, worms, rodents, and insects rework the ...
