It's been a while since I posted. Not worked on my 51 3600 since last November. Last weekend I got most of the truck back in my garage from the metal shop. I rebuilt the entire drive train, engine, transmission, drive shaft and rear end. That includes changing the gears from 5:14 to 4:11. Total frame off, every nut & bolt has been removed, cleaned, repaired or replaced. Now I have a pile of parts ready to begin reassembling. Hope I don't have too many left over parts when I am done!