I am thinking about having my original rear end rebuilt, but I'm not 100% sure that the new one is bad, I need to have my mechanic check some other things, I just seem to be getting a lot of back pressure that causes vibrations and whining noises when I coast, which is not the same problem I had on my other rear dif, that one was just loud whenever the truck was moving no matter how slow or fast and no matter if I was accelerating or coasting. My mechanic already adjusted a bolt that connects the u-joints and that has reduced the vibrations, but it still makes a lot of noise and some vibration when I coast. Before the adjustment, I could feel the vibrations through the whole truck and even on my foot on the pedal, as if i were driving over a rough old paved road, but now the vibrations are limited to feeling like they come from the rear end. I'm not sure if this "new" used rear end is bad too or if I just need more adjustments down there.
Does anyone have any information about this problem with my model? Any advice?