ACC GMC C/K Trucks Vinyl Flooring

Choose your vehicle application, then compare materials, coverage and options on each listing.

Square-body GMC vinyl flooring is not one-size-fits-all: identify the transmission hump and shifter first. These molded kits separate C and K series trucks by cab, drive and column or floor shift, with 1-piece regular-cab floors and 2-piece crew-cab coverage.

Small Hump, Large Hump, Column Shift or Floor Shift

The most useful phrase in square-body flooring listings is not the color. It is the hump. Square-body flooring catalogs divide 1973-1987 molded vinyl by standard cab, small hump and large hump, while OER's full-cab floor listings warn that a 2WD column-shift application is not for floor-shift or 4WD models. The ACC applications make the same distinction in product language: Auto 400 column, Auto/3-speed column and 4-speed floor are separate moldings. Identify the tunnel and shifter before choosing a C15, C25, C35, K15, K25 or K35 kit.

1973-1974 Shows How Specific the Moldings Get

The first applications in this collection are unusually detailed. Regular-cab 2WD trucks use 1-piece vinyl, while crew cabs use 2-piece coverage. C15/C1500, C25/C2500 and C35/C3500 each separate the Auto 400 column, Auto/3-speed column and 4-speed floor versions. The K15/K1500, K25/K2500 and K35/K3500 4WD listings use Auto/4-speed applications rather than borrowing the 2WD choices. By 1975-1978, the C15 regular-cab line still calls out a 4-speed floor-shift version. Treat those title details as the fitment, not as decoration.

Vinyl Versus Carpet Is About How the GMC Works

Raybuck's replacement-flooring guide frames the decision cleanly: carpet gives a more finished, insulated interior, while vinyl is chosen for durability, moisture resistance and easier cleaning. A Sierra street truck that spends its life on pavement may be happier with carpet. A farm, shop, plow or hunting truck that sees wet boots is the natural audience for molded vinyl. The advantage is not that vinyl turns the cab into a hose-out utility vehicle; it is that spills and grit sit on a surface made to be wiped down instead of soaking into pile.

Do Not Ask New Vinyl to Hide a Leak

Owners on the 1947-Present Chevrolet and GMC Truck Message Board raise the right objection: flooring does not stop rust arriving from below or water running down a kick panel. Fix windshield and cowl leaks, inspect the pan, and repair corrosion before the vinyl goes in. Sound or heat mat can go under the flooring when the build needs it, but the original covering should remain your reference until the new molded piece is trial-fitted and every shifter or seat opening is marked.

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