One Wicked 800 HP 2007 Dodge Ram 2500 Work Truck

This 800hp Hay Hauler is also a Track Terror

Jason Sands
May 25, 2015
Photographers: Jason Sands
There are some folks who use their diesel trucks as daily drivers and others who may only use their rigs for occasional trips. Then there’s another segment of diesel enthusiasts: folks who really push their truck to its limit and beyond.
"While transporting cattle, cars, and other goods is second nature for Larry and his 2500, in 2009 he decided he would give drag racing a try."
Larry Brown is definitely that type of owner—one who simply has no boundaries when it comes to things he does with and to his Cummins-powered ’07 Dodge Ram 2500. Do you dig the truck’s aluminum work bed? Well, it’s been on three different trucks and has racked up more than 700,000 miles. The bed’s latest home is on Larry’s rig, which was used as a normal work truck…until he got a little carried away.
Photo 2/21   |   The engine in Larry Brown’s Ram is a mix of 5.9L and 6.7L Cummins parts, and it combines the best of both to make 6.4 liters worth of displacement. The single-turbocharged mill puts down 794 hp at the wheels along with 1,436 lb-ft of torque (using the hottest tune), while retaining good street manners when towing or daily driving.
While transporting cattle, cars, and other goods is second nature for Larry and his 2500, in 2009 he decided he would give drag racing a try. “It ran high 16s, but I could make pass after pass with the truck, which is what I really enjoyed. A lot of people seemed to think it was pretty fun and fast for a work truck, so I decided to make some modifications,” says Larry.
First, of course, was basic programming, but soon more and more upgrades ensued. After a few years of racing his hopped-up work rig, Larry decided to step up his game and build what he considers to be “the ultimate Cummins powerplant”—one that is reliable for racing and work use. Larry has accomplished his goal, using some of the best parts the different generations of Cummins engines have to offer.
Photo 3/21   |   At the track, the Dodge leaves incredibly hard and with the nose slightly up thanks to 4.10:1 Yukon gears in both differentials, along with a Detroit Truetrac in the front differential, which complements the stock limited-slip in the rear. Although the truck has run an 11.44-second e.t. at 116 mph in the quarter-mile, Larry says his Dodge can go quicker if he ever elects to put a rollcage in it.
For starters, Larry selected a 6.7L block for strength, which he paired with a 5.9L crank, resulting in 6.4 liters of displacement. The stock connecting rods were also discarded in favor of a set of Carrillo rods and new 6.7L pistons that were coated and fly-cut, and the entire assembly was balanced. The machine work isn’t limited to the bottom end, however. The 6.7L head was also fire-ringed and is secured with ARP 625 studs for good measure. The valvetrain is also modified, with Diesel Pros getting a call for a custom camshaft grind and performance valvesprings.
Photo 4/21   |   A stock single CP3 pump won’t support the power Larry’s Cummins produces, so an ATS Diesel Performance Twin Fueler upgrade kit that employs a second Duramax CP3 is used to make sure the the 45-lpm Industrial Injection injectors get plenty of fuel.
The airflow and fuel systems on Larry’s truck were carefully designed for his performance goals. He knew he wanted to run at least mid-11-second quarter-mile times, so he went about making the power needed to get there. The airflow path starts with a Banks Power Ram-Air system, which is connected to a quick-spooling Garrett GTX4202R turbocharger. The turbo blows through a Mishimoto intercooler and into the engine via a Glacier Diesel Power Mega-Flo S-2 intake manifold. On the exhaust side, the turbo is mounted with a Steed Speed exhaust manifold that feeds the Garrett and then exits via an All Out Diesel 4-inch downpipe and into an ATS Diesel Performance dual exhaust. For fueling, an AirDog lift pump sends diesel to twin CP3 injection pumps that supply balanced 45-lpm injectors from Industrial Injection.
The last thing Larry wanted for his new engine was some sketchy tuning, so PCM calibration was performed by Ryan Milliken of Hardway Performance. The truck has multiple tunes that range from nearly stock to all-out race, which enables Larry to switch between programs for the NHRDA’s 11.90 Class, Bracket Classes, or local grudge races. Dyno numbers of 794 hp and 1,494 lb-ft of torque (with the biggest tune) make Larry a pretty happy camper.
Photo 5/21   |   A quick-spooling 75.8mm Garrett GTX4202R turbocharger makes the Dodge Ram driveable and also sends 60 psi of boost to the engine to make it go like heck. A heat-wrapped housing and 4-inch downpipe send exhaust gases back toward the rear of the truck.
In a heavy, all-purpose truck like Larry’s, the transmission must be incredibly strong. With 4.10:1 gears, front and rear lockers, and grippy Yokohama Geolandar tires, the Ram launches with stout 1.65-second 60-foot times when it’s turned all the way up, which can wreak havoc on even the stoutest transmission parts. Fortunately, the 2500’s 48RE automatic transmission is built to the hilt by Larry and some friends, with upgraded shafts from TCS. The output is 9310 steel, the intermediate is made from 300M, and the input shaft is made from Aermet, the same stuff airplane landing gear and Top Fuel head studs are made of. In addition to the shafts, TCS’ billet steel front drum and larger aluminum piston are also installed in the upgraded transmission. All the hard parts are tied together through a valvebody from Goerend Transmissions, and the gearbox is connected to the engine via a TCS triple-disc torque converter and BD Diesel Performance flexplate. A deeper transmission pan from Mag-Hytec along with BD’s oversized transmission cooler keeps all the fluid cool.
Photo 6/21   |   Larry isn’t kidding when he says he works his rig hard. Here the truck is seen hooked to a two-car trailer hauling a ½-ton truck and his son’s Cobra kit car.
With the help of his son, his friends, and numerous shops including Diesel Power Products, his local haunt, Larry has built a rig that meets his need for speed and can also be used as an everyday work truck. The engine in his Dodge brings the best parts Cummins has to offer together into a single package that raises some eyebrows no matter where the truck is taken—be it the ranch, dragstrip, or just down to the grocery store.
Fast Facts
Year/Make/Model: 2007 Dodge Ram 2500
Owner: Larry Brown
Hometown: Kennedy, Texas
Odometer: 250,000 miles
Engine: 6.4L Cummins I-6, 5.9L crank, 6.7L block, Carrillo rods, 6.7L cut and coated pistons, Diesel Pros camshaft and valvesprings, Haisley Machine pushrods, ARP 625 head studs, fire-ringed head, and balanced rotating assembly
Fuel: Industrial Injection 45-lpm injectors, ATS Diesel Performance Twin Fueler dual CP3 injection pump kit, AirDog II lift pump, and tuning by Hardway Performance
Air: 75.8mm Garrett GTX4202R turbocharger, Banks Power Ram-Air intake, Mishimoto intercooler, and Glacier Diesel Mega-Flo intake manifold
Exhaust: Steed Speed T4 exhaust manifold, All Out Diesel 4-inch downpipe, and ATS Diesel Performance dual exhaust
Transmission: Dodge 48RE four-speed automatic, Aermet input shaft, 300M intermediate shaft, steel output shaft, billet front drum, oversized piston, upgraded clutch packs, Goerend Transmission valvebody, BD Diesel Performance flexplate, Mag-Hytec pan, and TCS triple-disc torque converter
Horsepower: 794 hp
Torque: 1,494 lb-ft
Tires: 315/70R17 Yokohama Geolander
Wheels: 17-inch stock fourth-generation Dodge Ram
Suspension: Rear sway bar from a Ford Super Duty
Axles: 4.10:1 Yukon gears with a stock limited-slip (rear) and Detroit Truetrac (front)
Fun Fact: Larry is one of the few guys who isn’t afraid of breaking his truck during Diesel Power Challenge. He has entered the voting two years in a row and says his rig is ready!
Photo 7/21   |   2007 Dodge Ram 2500 Work Truck
Photo 14/21   |   Just like the Hurst shifter mentioned earlier, Larry’s muscle car tribute continues at the rear of the truck, with an ATS Diesel Performance exhaust that features dual 4-inch rear exits.
Photo 18/21   |   Despite the flatbed being installed on two other trucks before Larry adapted it to this 2500, its 700,000-mile finish is always polished to a bright shine.
Keeping tabs on engine and transmission vital signs is important for hot-rod diesel rigs. Isspro gauges that monitor boost pressure, EGT, exhaust backpressure, fuel pressure, and rail pressure can be found throughout the cockpit of Larry’s Dodge.

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