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.
Originally Posted by fxk142
U-1300L Unimog with 10' Alaskan camper, OM-366A turbo-Diesel, fast axles, overdrive, Werner 12k winch
Various other mogs for work and play.