Sierra 2500 HD

Built to handle heavy payloads, provide impressive performance, and execute years of reliable service, the6.6L Duramax L5P is an absolute workhorse. However, as with any factory vehicle, some systems have limitations and areas that can be improved. Our...

Built to handle heavy payloads, provide impressive performance, and execute years of reliable service, the6.6L Duramax L5P is an absolute workhorse. However, as with any factory vehicle, some systems have limitations and areas that can be improved. Our...

Built to handle heavy payloads, provide impressive performance, and execute years of reliable service, the6.6L Duramax L5P is an absolute workhorse. However, as with any factory vehicle, some systems have limitations and areas that can be improved. Our...

Mishimoto has expanded our line of Duramax performance parts to include a performance intercooler for the Chevrolet/GMC 6.6L Duramax L5P. High intake temperatures can reduce performance and potentially cause engine damage if left unchecked. Protect your...

The Titanium Signature Series diesel fuel Systems are the superior fuel System and filtration System, in the diesel industry. This is because here at FASS Fuel Systems we focus on perfecting our Systems and how they are engineered, taking the extra steps...

The Titanium Signature Series diesel fuel Systems are the superior fuel System and filtration System, in the diesel industry. This is because here at FASS Diesel Fuel Systems we focus on perfecting our Systems and how they are engineered, taking the...

Whether you're tackling tough terrain or smooth city streets, Rough Country's Nitrogen-charged V2 Monotube Shock Absorber leads the way, delivering impeccable ride quality and performance mile after mile. Rough Country's Monotube V2 Shocks feature an...

New for 2018 - ReadyLIFT now offers our popular 2011-UP GM 2500/3500 HD forged torsion key leveling kit with our all-new heavy-duty fabricated steel upper control arms. Our time-tested torsion key leveling kit is the strongest, safest leveling key system...

Has the rear of your vehicle started to sag, or are you looking to add a bit of lift height? Whatever the case maybe we have you covered at Rough Country. Upgrade your rear suspension with Rough Country's vehicle-specific block and u-bolt kit!Rough...

Rough Country's 3.5in No-Cut Kit offers easy installation and aggressive good looks at an incredible value. Take your truck to new heights with this excellent option for GM HD Models. This kit features a set of high-quality, tubular Upper Control Arms...

Improved Ground Clearance and Ride Quality. Take your workhorse to the next level with Rough Country's 3.5" Knuckle Lift kit. Rough Country's 3.5" Knuckle Kit provides an improved ground clearance and is designed for on or off-road driving. This...

The Allison transmission is the backbone of your L5P Duramax. It's responsible for transmitting large quantities of torque from your V8 diesel powerplant. This torque generates a lot of heat, and if that heat isn't dissipated, it can destroy your...