I have a 14 bolt rear and Dana 44 front with 4.10 gears for sale. A guy called about them, saying he had 4.56 gears in his '77, and wanted 4.10's. We talked and were thinking about trading. How common were factory 4.56 gears in a 14 bolt and Dana 44? It's a '77 3/4 ton 4x4 with a 4spd/205 (thats all I know about his truck so far).