Keith Seymore
Full Access Member
- Joined
- Jul 13, 2015
- Posts
- 2,881
- Reaction score
- 9,144
- Location
- Motor City
- First Name
- Keith Seymore
- Truck Year
- 1987
- Truck Model
- R10
- Engine Size
- 4.3L
Correct - it's the internal program code.The '88-'98 style trucks with the newer style body.
It went GMT400, then GMT800, then GMT900, then K2 (maybe) and then I don't remember - seems like there was a "T1" in there somewhere.
What might not be obvious is you can then build additional information into the program code, like GMT820 = short utility, GMT830 = long utility. GMT820C = Cadillac, GMT830D = Denali. GMT805 = Avalanche etc.
K