Please someone out there help me! Been on this for 4 months! Truck has 2 drive shafts-support in middle with u joint, bearing and bushing all replaced. rear drive shaft replaced along with bushing and pinion bearing. Front u joint attaches at tranny also replaced.The only thing I haven't replaced is front drive shaft! When I have it on jack stands it seems to make a lot of noise in middle of drive train. Do u joints have to be aligned or balanced with drive shaft? Also replaced coupling on rear shaft which joins short section to a large bearing and pinion bearing going into rear end. Please help.