I ordered the 8" Rize 4link front lift for my 06 F250 Fx4 and a 2.5in Leveling kit. Should i order 6" or 8" rough country rear leaf springs. I dont want the back to be higher than the front, i dont mind if the front is a little higher than the rear though. I also orderd 38x13.5r24 Nitto Trail Grapplers. Any help is appreciated.