Everything you want to know about NAPCO trucks.
http://napco4x4.org/
"Modern" 4x4 usually have a 3.73 ration with autos, 4.11 with standard transmissions. 265 will rev a lot more than a stock 350, I ran a 283 .30 over from 85 to 2000 with no issues at highway speeds (3.73 rear). In addition to the cast logo the transfer is divorced and way back, so they have a long front driveline and in/out lever. May or may not have the fender trim it was shipped in the box and up to the customer to install. Should have the shift pattern instructions on the dash or inside the glove box lid, sometimes they stuck them on the cab roof above the windshield too. Worth saving but PITA if they break.