Originally Posted by BigFuel
A binding feeling ought to just be the feeling of the truck resisting movement. Same thing with a dragging brake and it can happen with no noise if the brakes are cool and on one side as well as both. If there is a "thunk" with the resistance of movement then it's something deeper. While you are digging at the problem take off the rear tires and blow out the brakes. Inspect for oil leaks and the pads at the same time.
TTB (D50) or solid front axle? Why I'm still asking about the front is because weird sh!t can happen with a TTB (or a 2WD with cross beam sys.) in reverse. If it is a TTB go into a open parking lot and drive straight forward and measure the top of the tire to the inner fender right above it. Then reverse for 20 feet and measure again. Does the truck "squat" and/or do the tires camber in?
I can feel the bind as well as hear it. clunks while binds. sounds/feels like when a u joint is real bad minus the squealing. I put the truck in the air and tried it but could not duplicate it. I also thought it could be a bad hub, until I heard it come from the rear when my buddy drove it while I listened from outside. it's a 250 so it has the d50 front, the front end is in pretty good shape as far as the wheels leaning inwards.