I have a 1972 Custom 1500 GMC Longbed pickup. Recently, I was hearing a clunk when I would put transmission in reverse. Now it clunks when I shift from park to reverse, or reverse to drive. I checked u-joints, and they seem to be ok. While driving it the other day, I started hearing a banging noise, then it stopped, as if something came loose and fell off. I looked in rear-view mirror and didn't see anything on road. The truck seemed to drive ok, no vibration. When I got home, I looked underneath truck and it looked as if rearend might have dropped some. This truck has a 2 piece drive shaft. The last time I replaced u-joints, I don't remember there being such a drastic decline of the driveshaft angle going from the center support bearing to the rearend. I don't know if this is the way the driveshaft is suppose to be. It seems to me that this angle would put rear driveshaft in a bind as far as working with rearend.
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