What is the truck's history? Was it running well last time it was used? What claims does the seller make? If I were in your situation I would make an agreement with the seller that if you discover a bad engine, bad transmission, or bad clutch or throwout bearing that he take it back with full return of your money. With these unknowns, your expense to get this truck going could be near zero, or very expensive in time and parts.
However, if you are getting a really good buy on this truck (which you should be) then it may be worth the effort. Keep in mind that you could buy a running 404 with known good components for maybe $5k.
Look at components for sale on the Expeditions Imports or other vendor's web page for an idea of cost if a major component is bad.
Bob

Originally Posted by
fxk142
Hi Guys,
I may have a line on a 404S for very cheap. I have not owned one before but read a bunch about them. What should I watch out for? Where do these things rust? This is a mid-60's 404S, with a box on the back. It has been sitting for a while as well. Gas motor, not running (needs fuel system gone over and battery). Knowing that this is won't be going out on a test drive, what should I be searching for problem wise? What goes on these things? What would be crazy expensive to repair if there are issues?
Thanks!
U-1300L Unimog with 10' Alaskan camper, OM-366A turbo-Diesel, fast axles, overdrive, Werner 12k winch
Various other mogs for work and play.