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A Regular Production Option (RPO) is a 3-digit standardized code used by General Motors to designate vehicle options & modifications. RPO codes designate how a vehicle is built, and they've been used on dealership order forms and in assembly plants since at least the 1950s (see Corvette C1).
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)
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.
Considered a fleet vehicle by General Motors, the 9C1 package is considered a Special Equipment Options (SEO) code, as opposed to a Regular Production Order (RPO) code. Both groups of options are found on the production code sticker (which on most modern GM vehicles is located in the glove box).
Note: GM previously used the LS9 RPO code on 1969 and later Chevrolet trucks (both 2WD and 4WD) including Blazers, Jimmys, and Suburbans, as well as car carriers. The original LS9 was a 350 cu in (5.7 L) V8, developing 160 hp (119 kW) and 245 lb⋅ft (332 N⋅m) of torque.
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.
1995–2010 4T40-E/4T45-E — 4-speed light-duty (used in smaller front wheel drive GM vehicles) 1991–2010 4T60-E/4T65-E/4T65E-HD — 4-speed medium-duty (used in larger front wheel drive GM vehicles) 1993–2010 4T80-E — 4-speed heavy-duty (used in large FWD GM vehicles, only with Cadillac NorthStar V8 and Related Oldsmobile V8)
Although GM made these modifications to the engine, it was still referred to with the RPO LB4 code. The majority of the naturally aspirated LB4's long-block was shared with the turbo version. However, the vehicles that used the 4.3 L (262 cu in) turbo engine also included RPO code ZR9.
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