4x4 duallys are a unique vehical. I recently swapped a low milliage , big block, solid, 85 camper special LOADED civi. dually for a rusty 85 civi 4x4 dually, just because I wanted the drivetrain (sm465, np205, dana 60, 14 bolt ff with a nice frame) just to put under my 69 towtruck. (G.M. NEVER...