The 2500HD/3500HD suspension and axles were the same as the previous generation.
2005 cateye duramax manual#
Paired with the Duramax LLY engine was a choice of either a ZF S6-650 6-speed manual transmission or the heavy-duty Allison 5-speed automatic transmission. Between 2004.5-2005 the Duramax LLY was rated at 310 hp and 520 lb-ft of torque, which was only a 10hp increase over the 2004 LB7, but the power levels were now produced at a lower rpm, which aided in towing and hauling heavy loads. The VVT style turbocharger also provided better throttle response throughout the entire RPM range.
Featuring a 62.6mm inducer compressor wheel and the tallest turbine vane height (15mm) of any GT3788VA, it offers enough flow to support up to 530hp. It was the largest version of the factory Garrett GT3788VA used in a Duramax from 2001-2016. The biggest upgrade, literally, from the LB7 Duramax was the new Variable-Vane Turbocharger (VVT). To avoid similar injector issues that plagued the LB7, new externally serviceable fuel injectors were now added. In addition, the high-pressure common-rail fuel system with a Bosch CP3 injection pump that debuted in 2001 was still utilized. The LLY continued to utilize several components from the first generation Duramax (LB7), but also included some new components that increased performance.Ĭarried over from the LB7 Duramax to the LLY was the same basic short block featuring a cast-iron block with aluminum heads. Since the carryover LB7 and new LLY engines were both available in the same year, the LLY is unofficially referred to as the 2004.5 model year by the diesel aftermarket and enthusiasts alike.
Halfway through the 2004 model year, the second generation of the Duramax diesel engine was introduced in the Chevy Silverado and GMC Sierra 2500HD/3500HD pickups. Posted on Septemby Jeremy_XDP 0 History/General Info
Buyers Guide, Duramax 2004.5-2005 GM 6.6L LLY Duramax Buyer’s Guide
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