the noise goes away when I clutch it because it is not in gear anymore-the mid shaft assembly at the bearing has a grease cert and will not hold fluid.I installed a new pinion bearing. I replaced all bushings (2). I installed new rear drive shaft and coupling.I replaced mid shaft bearing. I replaced both u joints. When I test drive it the noise is worse when I let off the gas.Have you also had all this same trouble? Thanks for your reply.