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In August 1998, General Motors released the GMT800 generation of full-size pickups for the 1999 model year as the replacement for the fourth-generation C/K trucks introduced for 1988. The long-running C/K nomenclature was retired by Chevrolet in favor of a singular Chevrolet Silverado nameplate (as GMC had done in 1988 with the GMC Sierra).
First-generation Chevrolet Silverado 2500HD (2001–02 Regular Cab) The GMT800 Silverado/Sierra 1500 and 2500 pickup trucks were released in August 1998 as 1999 models. The "classic" light-duty GMT400 C/K trucks continued to be produced for the first two years alongside the new models, and the Heavy-Duty GMT400 pickups (alongside the GMT400 SUVs) were continued until 2000, with the new GMT800 ...
This resulted in a redesigned timing cover with a wider bottom flange, making it incompatible with the 1996–06 LU3/L35. The only vehicles using the new revision of the 4.3 L (262 cu in) were the half-ton versions of the Chevrolet Silverado/GMC Sierra (2007–2013) and Chevrolet Express/GMC Savana (2008–2014).
The first generation of the Chevrolet Silverado is a series of trucks manufactured by General Motors from 1998 until 2007 under the Chevrolet brand and also as the GMC Sierra. Built on the new GMT800 platform, the Silverado/Sierra 1500 and 2500 pickup trucks were first released in August 1998 as 1999 models.
It was replaced by the 4.8 L Vortec 4800 LR4 for the 1999 Chevrolet Silverado/GMC Sierra trucks and 2003 Express/Savana vans. In C/K trucks, the 5000 produces 230 hp (172 kW) net flywheel at 4600 rpm and 285 lb⋅ft (386 N⋅m) net flywheel torque at 2,800 rpm.
With the unveiling of the 2022 model year Silverado, GM announced a significant revision that stiffened and strengthened the engine allowing for a GM-estimated increased maximum torque rating of 430 lb⋅ft (583 N⋅m) while also improving noise, vibration, and harshness (NVH). [1] Parts are cast at Bedford Casting Operations in Indiana. [2]
The High Value engine family from General Motors is a group of cam-in-block or overhead valve V6 engines.These engines feature cast iron blocks and aluminum heads, and use the same 60° vee bank as the 60° V6 family they are based on, but the new 99 mm (3.90 in) bore required offsetting the bores by 1.5 mm (0.059 in) away from the engine center line.
Starting in 2009, it was also available in the Chevrolet Silverado and GMC Sierra, as the L9H, with power ratings of 403 hp (301 kW) and 417 lb⋅ft (565 N⋅m). Engines built prior to April 1, 2006, contained AFM hardware; however, the mode was not enabled in the PCM, and thus the system was not functional.