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Neptune
GMC Suburban Sierra Classic K-25 (4wd ¾ ton)
Grille work was used from 1985 to 1988 (model years) Newer models got De-chromed windshield trim, which means this one is likely a 1987 or 1988 model. 1987 was the first year for TBFI (Throttle Body Fuel Injection) also sometimes just referred to as TBI.
Ones equipped with the Trailer Tow Package, came with Class IV Weight Distributing hitches, Transmission Oil Coolers and Trailer light wiring.
Grille work was used from 1985 to 1988 (model years) Newer models got De-chromed windshield trim, which means this one is likely a 1987 or 1988 model. 1987 was the first year for TBFI (Throttle Body Fuel Injection) also sometimes just referred to as TBI.
Ones equipped with the Trailer Tow Package, came with Class IV Weight Distributing hitches, Transmission Oil Coolers and Trailer light wiring.