Had similar problem with my brothers truck. Found out the bearing cups on the rear u-joint were not fully seated against the universal joint. Found it by grabing the drive shaft in the rear was able to feel slight side to side movement.
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72 Chevy A/C P/B P/S Tilt
454 Engine 400 TCI Trans
3" Exhaust W/Headers
C30 Frame C10 Suspension
Short Wheel Base (Dually)
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72 Chevy A/C P/B P/S Tilt
454 Engine 400 TCI Trans
C30 Frame C10 Suspension
Short Wheel Base (Dually)
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