If your dana 60 is hard to turn you need to find out why I have set many of them up per the Mopar service manual, they spin very easy when set up correctly. My 8 3/4 had a bent housing, it did not spin easy at all There are many reason a rear end won't spin easy, tight brakes, bent housing, bad gears, burnt up bearings, to tight backlash, mismatched tire circumference using a spool and so on