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History of the 1967-1972 GMC C/K Series Pickup
1967 was the initial year that Chevrolet Motor Division and GM Truck and Bus Division agreed to split platform production. The former would make all light trucks, with GMCs essentially becoming rebadged Chevrolets, while GMC would build all larger trucks, supplying Chevy with rebadged units. As such, while the all-new 1967 GMC pickups shared the same chassis and sheet metal as Chevrolet, it was available with a GMC unique engine, the 305 cid V-6. This was in addition to GMC now also using Chevrolet’s sixes and V-8s. During 1969, GMC’s unique V-6 engines were discontinued for the C/K series, marking the end of an era. From then on, GMC and Chevrolet pickups all had identical drivetrains.
GMC’s trim lines also paralleled Chevy. From 1967 through 1971, they ranged from the basic Deluxe up to the Custom and the Super Custom at the top end. Changing for 1972, they then went from Custom, Super Custom, Sierra, to a new premium Sierra Grande which matched up with the Cheyenne Super.
One area that GMC remained divergent from Chevrolet was in fewer and less complex changes to the grille. While Chevy made major structural changes to their grille design in 1969 and 1971, GMC essentially stayed with one basic design. Minor changes were moving the GMC lettering from the center bar of the grille in 1967 to the hood in 1968, then revising the stamping to incorporate revised borders to give the impression of having separate left and right side grilles for 1970. For all years, GMC used four headlights instead of Chevrolet’s two.
While GMC also used the C (two wheel drive) and K (four wheel drive) model designators, they differed from Chevrolet in that they used four digit numbers for the weight range. This was partially due to coordinating with their medium and heavy-duty trucks that were already using four digit model codes. As such, half-tons were 1500s, three-quarter tons were 2500s, and one-tons were 3500. Therefore, a half ton four-wheel drive GMC was a K1500.
1971 GMC C2500 3/4 Ton Info
2dr Chassis & Cab
2dr Fenderside Pickup
2dr Wideside Pickup
6-cyl. 250cid/145hp 1bbl
6-cyl. 292cid/165hp 1bbl
8-cyl. 350cid/250hp 4bbl
8-cyl. 402cid/300hp 4bbl
8-cyl. 307cid/215hp 2bbl
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