Usually buying a NAPCO truck, even missing motor and front clip would be a no brainer. Very Rare, vary desirable. Less GMC's than Chevy were made.
BUT.....there are a whole lot of so called NAPCO's that are not Napco's. The transmission is a transmission. There is no Napco Transmission (SM420). GMC began factory assembly of NAPCO in 1956. You could also order the kit to be dealer installed. A factory installed would have GVW tag of 5400/5600 and an upfitted would have 5000. It should have 7 leafs in front and 8 in rear if factory.
Sometimes any old 4x4 donor parts are called Napco. Those are not the money shot however.
You need to see if it has the Rockwell/Timken T221 or Spicer 23 Xfer case and Napco tagged front axle, all three complete driveshafts with slip yokes, the weird looking 4x4 shifter and old shift decal inside cab. A good deluxe chrome GMC gauge dash is money as well as the other dash components, none of which fit Chevy. Heater controls, radio, etc.
As usual, RUST is number one as well as overall condition. 56 GMC has a fancy and very expensive front grill assy. That's why it is already sold off. What is the VIN? 101 X? VIN tag on driver hinge pillar. No frame stamps on GMC. Title? Don't buy someone's stripped and cobbed together mess. If it does not have most of the stuff I mentioned, watch out!!! Don't count on the transfer case being good. It could cost big bucks to fix. Check the domed end caps to be sure they are not broken thru. They are visible on outside of T-Case.
If he has ALL the legit Napco running gear, suspension, levers, linkage, drive shafts, transfer case, all with proper tags and frame brackets to mount the T221....just that is worth about the asking price. The rest can be sold, as said, to recoup much of that, if not all.
