The 2004.5-2005 Silverado/Sierra 2500HD/3500HD trucks should be relatively dependable if all the proper maintenance has been performed and any overheating issues were addressed in a timely manner. Factory Dowel Pin that Holds the Harmonic Balancer can Shear Off.Overheating Issues Especially While Towing.IFS Provides a Smooth & Comfortable Ride.A crankshaft pin kit is an easy way to secure the balancer in place and make sure it does not move. Finally, the dowel pin that locates the harmonic balancer on the crankshaft can shear off, allowing the balancer to spin on the snout and possibly result in damage to the engine. Upgraded tie rod ends or sleeves (to reinforce the factory tie rods) are available to fix this issue. Overheating for an extended period can potentially lead to head gasket issues, so make sure to do your due diligence before purchasing a truck.Ĭommon issues that carried over from the 2001-2004 model trucks include the weak stock tie rods which have been known to potentially bend or break in some extreme conditions. It’s not completely unusual to see coolant temps surpass 230 degrees in an LLY Duramax truck. This is due to a combination of a restrictive turbo mouthpiece, an undersized radiator, or even a dirty coolant stack (radiator, intercooler, condenser, and transmission cooler) blocking airflow. LLY IssuesĪ common issue with the LLY was overheating, especially when towing. If leaks occur it can cause a potential safety hazard. Also, both the brake and fuel lines are also known to get rusty over time and can rupture or leak. The bedsides, rocker panels, and bed cross members/floor supports are also common areas for rust. If the truck spent any time in a region that gets snow thoroughly examine the frame for rust/rot. With any older pickup, they are especially prone to rust. The Duramax is the superior option for towing and should also provide the best fuel economy of the three choices. As always, the Duramax diesel is the most desirable drivetrain and will command a premium over the two gas-powered choices. Just like the previous years, the 2004.5-2005 GM 2500HD/3500HD models came equipped standard with a Vortec 6.0L gas engine and offered two optional engine choices, the 8.1L big block or the 6.6L Duramax LLY. Thus, the Chevy Silverado went relatively unchanged from 2003-2007, with the GMC Sierra receiving very few changes since its release in 1999 all the way through 2007. The Silverado/Sierra continued to ride on the GMT800/880 platform and was used up until 2007 when the new GMT900/910 debuted. The Duramax LLY was offered in the Chevrolet Silverado HD and GMC Sierra HD as well as the Chevrolet Kodiak, and GMC TopKick models. The rear setup kept the GM 11.5″ solid axle (also known as the AAM 11.5″) with multi-leaf springs. The front consisted of an independent long-arm and short-arm setup with torsion bars and an AAM 9.25″ assembly. The 2500HD/3500HD suspension and axles were the same as the previous generation.
#2004 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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