Hi, New to the sight and hope somebody can help before I scratch a hole in my head. I just got a big bolt 55 GMC, 5/10 lug long frame w/ 270ci and Hyda-Matic. There are NO ID plates anywhere to be found on the ca, just the motor numbers. No idea why. Have a title number, but that helps 'NONE'. I need to figure out which series it is. ANY idea how to determine this without any ID plates? OH YEAH, the grill emblem is rusted off so thats no help. ALSO, it has a 2 speed, direct/under aux trany between the Hydra-Matic and rear axle. In my opinion, it looks like a factory part. How do I determine what it is, and what to call it so I can research it. I'd like to figure out if theres a market for it and what it might be worth? Once I get the motor tuned, the complete drivetrain and both axles will be for sale to make room for all the guts outa my '78 4X4 with the bad frame.
Any info with be great help. Thanx, Mark
