Short bed or long bed? There is no true production number on 77 but based on all the other years that's probably a fairly accurate number for short beds 2wd 1/2 tons 440 trucks. I own a 77 Adventurer SE swb 440 with dual tanks plus most other options as well. 77 was the year Dodge was going away from the in cab tank but if you ordered a short bed dual tank truck early in the production it still came with the in cab tank. Later production 77's and most trucks for the west coast that year had both tanks in the bed. Here's a picture of mine.