I have a 2000 1500 sport with the 5.9. It has a 5.5 fabtech lift sitting on 35" bfg mud km2s. I recently bought but not installed yet, 3" coil spacers and a 6" block to replace the 3" block the kit came with for a total of 8.5" of lift. I plan on getting a 3" body lift bringing the grand total to 11.5 inches of lift. Now ive been looking around and have been thinking about getting 4.88 gears for my D44 and Chrysler 9.25. Is this the right gear selection for 38-39.5" tires?? help please!!