i am doing a quick look over on the truck and noticed that its quite hard to spin the rear tires by hand. i had the slushbox in neutral, tcase in 2wd, took brakes off. it was harder to spin backwards than forwards. next i put tcase in 4wd same thing. tcase in neutral same thing. tcase in 4low A LOT easier to spin. ???? at first i thought brakes so i took them off. then i checked diff fluid good, then i thought it could be the transmission so thats when i tried shifting tcase. WHATS GOING ON???? why would it be easier to spin the rear tires by hand when tcase is in 4low.