Chevrolet first introduced different body styles for trucks in 1973, with a more rounded, longer-running line of styles that would be used in Blazers, Suburbans and full-ton trucks through 1991. Internal specifications for Chevy trucks were similar from year-to-year, with buyers having the choice between different sizes and types of motors, transmissions and other major parts.
Several different engine packages were available for buyers of new Chevy trucks in 1984. It was the last year that the 250-cubic-inch inline motor was available in Chevy trucks -- this motor was replaced in 1985 by a 4.6-liter V6 engine. Other unleaded gasoline engine options were a 292-cubic-inch inline, a 305-cubic-inch V8, a 350-cubic-inch V8 and a 454-cubic-inch V8. A 379-cubic-inch V8 diesel engine was also available. Horsepower created ranged from 120 hp for the 250-cubic-inch inline engine to 230 hp for the 454-cubic-inch V8. The various engines created 210 to 360 foot-pounds of torque.
The 1984 Chevy K10 and K20 four-wheel drive trucks were available in either 6-foot or 8-foot bed models. The model with a 6-foot long bed had a wheelbase of 117.5 inches and an overall length of 191.3 inches. The 8-foot long bed model had a wheelbase of 131.5 inches and a total length of 212 inches. Both versions had a front track width of 65.8 inches and a rear track width of 62.7 inches. The K10 model had a height from road to roof of 72 inches while the K20 model had a height of 73.9 inches.
In 1984, Chevy K10 and K20 four-wheel drive trucks were available with different transmission options. This was the first model year where a four-speed manual transmission was available on non-diesel models. A three-speed manual and four-speed manual with overdrive were also available, along with three-speed and four-speed automatic transmissions. The four-speed manual transmission had the widest gear ratio, ranging from 6.55:1 to 1.00:1. K10 and K20 models came with aluminum, chain-driven cases that had lower ratios but lacked the durability of the cast-iron, gear-driven case found in the K30 model.
Models were also available in different axle ratios depending on the engine size and models. K10 trucks were available in axle ratios ranging from 2.73:1 to 4.10:1. K20 trucks had axle ratios available from 3.73:1 to 4.10:1 and K30 trucks came with axles ranging in ratios from 3.73:1 to 4.56:1.
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