Strange clunk

[ChevLoRay]

I once bought a '76 Blazer 4WD. There was a stack of tickets in the glove box, all of which were about trying to resolve a clunk when starting or stopping. One of the fixes was to install a part-time kit in the NP203 transfer case. Another was to replace the torque convertor bolts (when replacing the starter drive, I found 2 of those bolts in the nose of the starter). Anyhow, the problem was the combination of 12-inch wide wheels, with 1200-15 Swamp Thing tires on them, and ultimately was fixed by lubricating the slip yoke on the front driveshaft. I also replaced the wheels with a set of 8-inch wide wheels and then put a set of 31-11.50 Wrangler radials.

All because of a lack of lubrication.......