My 1972 GMC Napco K5500… The World’s Rarest ‘67-72 Truck! Factory Toroflow Diesel/Allison Behemoth!
A little background and story on my 1972 GMC Napco K5500! Enjoy. Engine is a DH478 Toroflow backed by a 6 speed Allison Trans. 1 of 2 ever made with this combination and the factory Napco 4x4 conversion.