Chrysler Full-Size Trucks 1997-2000 Repair Guide
Low speed knock is generally caused by a worn U-joint or by worn side-gear thrust washers. A worn pinion shaft bore will also cause this.
Vibration may be caused by:
Missing driveshaft balance weights
Loose lug nuts
Damaged axle shaft bearings
Loose pinion gear nut
Excessive pinion yoke runout
Bend axle shaft
Check for loose or damaged front-end components. Trouble here can contribute to what appears to be a rear end problem.
A snap or clunk when the vehicle is shifted into gear (or the clutch engaged) can be caused by:
high engine idle speed
Loose spring mounts
Loose pinion gear nut and yoke
Excessive ring gear backlash
Excessive side gear-to-case clearance