I think i had a 6 inch lift on my dodge also . it was 3/4 ton so thats all it needed for the 38 inch tires to fit. we redone the kit like 3 or 4 times to get it right and still ate the tires off and drove like shit. we could either get it to drive great witht the drive line angle terrible or vice versa. really needed to cut the hub carriers off and turn them.My dodge started off as a 6" lift with a 3" body lift then we added 3" coil spacers off a different kit and fabricated up new 4 link arms instead of the 3 link that the kit came with. Added new dual steering stabilizers but that still didn't help. That truck was all over the place with those crappy Super Swamper tires. It was a fun truck at one point but towards the end it was nothing but problems.
That is next on my list of stuff to do....Air Bags. Surprisingly it actually still drives straight even though the ass is on the ground like that.