Chevrolet Kodiak

The Chevrolet Kodiak and GMC TopKick are a range of medium-duty trucks that were produced by the Chevrolet and GMC divisions of General Motors from 1980 to 2009. Introduced as a variant of the medium-duty C/K truck line, three generations were produced. Slotted between the C/K trucks and the GMC Brigadier Class 8 conventional, the Kodiak/TopKick were developed as a basis for vocationally oriented trucks, including cargo haulers, dump trucks, and similar vehicles; on later generations, both cutaway and cowled-chassis variants were produced for bus use.

Following years of declining market share, General Motors (in line with Ford Motor Company) sought to exit heavy-truck manufacturing. After struggling to enter joint ventures or sell the rights to its product line, the company ended production of the Kodiak and TopKick in 2009. The final medium-duty truck, a GMC TopKick 5500, rolled out of Flint Truck Assembly on July 31, 2009.

For the 2019 model year, after a ten-year hiatus, General Motors re-entered the conventional medium-duty truck segment. Developed in a joint venture with Navistar International, the Chevrolet Silverado 4500/5500/6500HD is a Class 4–6 vehicle. Slightly smaller than the Kodiak/TopKick, the 4500/5500/6500HD is marketed exclusively as a Chevrolet (with no GMC counterpart).

For 1981, General Motors introduced the Chevrolet Kodiak and GMC TopKick (officially designated the Chevrolet C70/GMC C7000) series of Class 7 trucks. The largest versions of the medium-duty C/K series, the Kodiak/TopKick were developed to accommodate the Caterpillar 3208 V8 diesel (sourced from the larger Chevrolet Bruin/GMC Brigadier). To fit the new engine (which used a larger radiator), a taller hood (repositioning the headlamps below the grille) was designed, requiring the cab to be mounted several inches higher. Though taller, the new hood design was shorter in length, reducing the BBC length from 98 to 92 inches.

In line with the Bruin/Brigadier, the Kodiak was offered with both single and tandem-axle drive configurations; both straight truck and semitractor configurations were produced. The Kodiak name followed the Chevrolet "frontier beast" naming tradition for its heavy conventionals (Chevrolet Bison and Chevrolet Bruin) while the GMC TopKick was a military slang term (following GMC Brigadier and GMC General).

Following Chevrolet's retirement from the Class 8 truck segment after 1981, the Class 7 Kodiak became the largest truck offered by Chevrolet, while the TopKick remained slotted below the Brigadier.

For 1990 production, GM released the second generation of the Kodiak/TopKick on the GMT530 architecture. After 1988, General Motors had ended heavy-truck production (replaced by Volvo GM-designed WhiteGMC vehicles), with the GMT530 trucks now becoming the largest vehicles assembled by the company. The Kodiak/TopKick nameplates now encompassed the entire GM medium-duty range, as the GMT400 C/K series (introduced for 1988) topped out with 1-ton 3500-series trucks.

Over its thirteen-year production run, the GMT530 platform underwent relatively few changes. As medium-duty trucks did not require airbags, the interior of the cab was retained through its entire production run. For 1997, a lower-profile "aerodynamic" hood became available (not offered on C8500 models, severe-service, or school bus applications). Models equipped with this hood featured C5500–C8500 badging rather than Kodiak/TopKick badging, a change which extended to standard hood models for 1998, effectively bringing the medium-duty trucks in line with the rest of the C/K naming convention.