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There were a few K-20 4x4s. But not many. Odds are it is a K-30.Either way, for 500~600 clams, I'd say you're in my friend.
1976 was the first year that the Bonus Cab (no rear seat) was made.1977 was the first year for the K30 Crew and conventional cabGM never produced a K20 series Crew Cab/Bonus Cab.
77 was the first year for the K30, Regular cab or crew cab. As for what year was the first available 4x4 crew cab I'd say 75-76 .I have a 76 and its a failrly rare truck its a Silverado/Camper Special with A/C and Cruise 350/TH350/NP203 Dana 44 front and 14-bolt rear Most of the other 76 crew cabs I've come across have been custom deluxe , with very few optionsThe 4x4 crew as I was told was made in response too Alaska Pipeline project .
Um , I own a 76 K20 Crew Cab .