Need to regear my stock 3.21 unlimited Sahara to at least a 4.88 as my 35s and 140lbs of New bumpers is running me at 12mpg in 4 gears only (manual) and with absolutely NO power whatsoever. However, the are no tags or ID info on my differentials. Neither the shop doing the work nor my dealer shop can figure it out. They can't order the parts without knowing this info. Anyone know anything more that a 44dana in the back and a 35 in front? Help, this beast is NOT drivable.