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However most RPO codes that are promoted to model names are appearance packages only, and are not related to speed or engine performance. Two examples are the Z28 and Z71. In the 1980s you could order a Z28 Camaro with a 2.5 liter engine, although this was rare. RPO Z71 was an off-road suspension for trucks that is not related to the drivetrain ...
An updated 4L60E, the 4L65E (RPO M32), was phased in the 2001 model year when coupled behind the 6.0 Vortec. Five-pinion front and rear planetaries, along with an additional 3/4 clutch allowing 7 clutches in the input housing and induction hardened input shaft assembly, were improved to withstand up to 380 ft⋅lb (520 N⋅m) of torque.
The 6.6L Duramax diesel engine (VIN code "L") is used on 2010 interim and 2011 Chevrolet Express and GMC Savana vans and 2011 Chevrolet Silverado/GMC Sierra HD trucks with RPO ZW9 (chassis cabs or trucks with pickup box delete). The LGH engine is rated at 335 bhp (250 kW) at 3,100 rpm and 685 lb⋅ft (929 N⋅m) at 1,600 rpm.
The 4L85-E (RPO MN8) is rated to handle vehicles with up to 690 ft·lbf (935 N·m) of torque. [4] The 4L85E is rated to handle vehicles with a GVWR of up to 18,000 lbs (dependent on axle ratio and vehicle) [5] Applications: 2002–2006 Chevrolet Avalanche 2500; 2001–2006 Chevrolet Suburban / GMC Yukon XL (8.1L Vortec only)
The Vortec 2200 (RPO code L43) is an OHV straight-4 truck engine. This engine is equipped with secondary air injection, and is flex-fuel capable. It is entirely different from the Iron Duke, and was the last North American iteration of the GM 122 engine. The 2200 uses an iron block and aluminum two-valve cylinder head.
Additional RPO codes are LQM 175 hp (130 kW) and LQN 190 hp (142 kW). Changes were made by GM to the 6.5 in their light trucks for emissions or reliability improvement. The 1992–1993 model years used a 6.5-specific Stanadyne DB-2 mechanical injection pump. GM replaced the DB-2 with the electronic throttle DS-4 in 1994–2000 vehicles.
RPO LWN was first introduced in 2016 and continued until 2022, after GM Thailand was dissolved in 2020. It is a 16-valve design with high-pressure common-rail direct injection. The diesel engine was discontinued after the 2022 model year. [8] [9] The following trucks use the LWN: 2016–2022 Chevrolet Colorado / GMC Canyon (North America)
detuned with different components, RPO code L2R 2023–present 231 kW (310 hp) @ 5600 RPM: 390 lb⋅ft (529 N⋅m) @ 2000 RPM 2023–present Chevrolet Colorado and GMC Canyon: 231 kW (310 hp) @ 5600 RPM: 430 lb⋅ft (583 N⋅m) @ 3000 RPM 2024–present Chevrolet Tahoe and GMC Yukon 223 kW (300 hp) @ 5500 RPM