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2005 Chevrolet Silverado 2500HD - Blue Streak

A Stock-Appearing, 580hp Duramax

Jason Sands
Aug 18, 2014
Photographers: Jason Sands
We often run into vehicles that are modified in a few key areas, while forsaking other components. Show trucks are frequently lacking on power, powerful trucks usually lack glamour, and daily drivers or vehicles with lots of utility typically have neither. This is not so with Jerry Allen’s 2005 Chevrolet Silverado 2500HD From the suspension to the engine to the custom pinstriping on the body, this Silverado 2500HDhas been modified. Jerry’s Duramax also has a number of interesting contrasts, such as retaining a catalytic converter yet being able to produce an impressive 578 rwhp. This truck was built for everything from daily driving to hunting trips well off the beaten path. It was this widespread usage that resulted in such a diverse build..
After purchasing the truck, Jerry knew the first move he had to make was to bullet-proof his drivetrain. He enlisted the help of Brown’s Diesel in Riverdale, California, for its diesel expertise and had the top end of the Duramax rebuilt with ARP head studs thrown into the mix, installed PPE exhaust manifolds and up-pipes, and added a PPE transmission cooler. The intake side of the 6.6L engine got some help from a Banks intercooler and Ram-Air intake, while a replacement Garrett Powermax turbo and Snow Performance water-methanol injection system got the nod for more power. Erick Brown from Brown’s Diesel handled programming with custom EFILive tuning available on a DSP5 five-position switch.
"The water-methanol injection picked up more than 60 hp on the dyno..."
Photo 2/14   |   2005 Chevy Silverado 2500HD Rear Three Quarter
With the Silverado 2500HD boasting more than enough power for a daily driver, Jerry then turned his attention to the rest of the drivetrain. Brown’s Diesel handled the Allison transmission build and installed a performance triple-disc torque converter from Goerend Transmission. The suspension, axles, and fuel system also received upgrades, with a 45-gallon Titan fuel tank replacing the stocker and a FASS 150-gph lift pump being added. An Eaton Locker, Pro Comp lift, and Hellwig sway bar round out the suspension mods.
Numerous well-thought-out modifications have led to a Chevy that’s quiet yet capable, drives and rides smooth, and is versatile off-road to boot. As an added bonus, it’s stock appearing yet makes plenty of power, too. While these types of projects are never truly finished, we’d say Jerry is well on his way to building a truck that can really do it all.
Photo 6/14   |   2005 Chevy Silverado 2500HD Side View
Photo 10/14   |   Although it looks mostly stock, a few choice upgrades and some careful tuning have resulted in a truck that can lay down 578 rwhp and still get 18 to 22 mpg on the highway.
Photo 14/14   |   To lower fluid temperatures, Mag-Hytec transmission and rear differential covers are used to dissipate heat.

2005 Chevy Silverado 2500HD
OWNER: Jerry Allen
HOMETOWN: Hanford, California
ENGINE: 6.6L Duramax V-8
FUEL: EFILive by Brown’s Diesel, FASS 150-gph lift pump
AIR: Garrett Stage I Powermax turbo, Banks intercooler and air intake, PPE exhaust manifolds and up-pipes
TRANSMISSION: Allison 1000 built by Brown’s Diesel
HORSEPOWER: 578 rwhp
TORQUE: 1,050 lb-ft (est.)
TIRES: Michelin LTX A/T2 285/65R18
WHEELS: 18x9-inch Pro Comp Series 6001
SUSPENSION: Pro Comp 6-inch lift with Rancho shocks
AXLES: 3.73 gears with Eaton ELocker (front)
FUN FACT: Despite the nice paint, Jerry goes off-road all the time on backcountry hunting trips.

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