I will check the differential oil and and pull the pistons and get back to you.
When I crank the engine by hand I feel some resistance at certain points in the stroke but no grating, grinding or clunking. I did notice some very deep grooves worn by the timing chain.
I cannot believe such a violent noise has not left any obvious signs. After the first bang, I coasted the truck down a long hill in third gear and it made no noise. When I got to the flat and started to accelerate it happened again but the noise stopped as soon as I let off the accelerator.
When I got home and the truck was loaded off the tow truck, I started the truck and nosed it into the garage. It sounded like I had rocks in the crank case the whole time until I shut it off. I tore it down before trying to diagnose the noise because the noise was so violently loud I expected pieces to literally fall out of the engine when I tore it down.
Tuesday, September 2nd, 2008 AT 11:48 PM