Originally Posted by outofcontrol
Can't I lift the rear axle to do the testing?
sounds dangerous but I've done it with cars and stuff. What if I just lift one rear dual off the ground and block the other three corners?
I won't go into the physics involved, but your rear tire/wheel assemblies weigh almost 250 pounds on each side, including the brake parts. I would not want that much weight spinning wildly (50 mph is hundreds of RPM, anything could fly apart) just off the ground.
The rear axle will not like only one wheel spinning, the spider gears will be howling, and the truck will try to move forward, even if it is not limited slip, which you will not know for sure without serious investigation. I doubt it is, but am not sure enough to risk the truck getting away from you and flying off jackstands, causing a good bit of damage. So, no to lifting both sides up, and definitely no to just one wheel.