My books tell me that it should be a 3 Ton, with a 248 GMC motor. GVW is 16000 and depending what form of truck it is, it may have a vehicle weight of 5386 lbs. The clutch is a 10 3/4" and the single speed axle would be a 7.16 ratio or the two speed would be 6.33-8.81.
OldGMCTrucks .com used to have a canadian number decoder but I don't know if it is still there.
