Tyler Rabbage’s ’03 Silverado is one of the few Cummins swaps we’ve seen performed on an ’01-’07 GM where the original power plant was a Duramax. The slushbox was torn down and reinforced with a billet input shaft, a triple disc torque converter from SunCoast, and a performance valvebody fitted with TransGo parts. In order for the 47RH to live behind the Cummins, Tyler once again turned to Outlaw Diesel in Miami for a helping hand. Instead, the torquey 12-valve is backed by a 47RH four-speed automatic, which (ironically enough) was sourced from the same person that sold him the truck years prior. To keep the swap simple (and namely void of electronics), Tyler chose to do away with the five-speed Allison. The downpipe and all intercooler tubes were fabricated by Outlaw Diesel in Miami, while the factory Duramax intercooler was reused. The tough-as-nails nature of the factory Holset HX35 got the nod for the manifold charger and produces the lion’s share of boost the engine sees. The BorgWarner S475 is internally wastegated, features a T6 flange, and is supported via a bracket bolted to the passenger side motor mount. Pegging the 60-psi boost gauge in the cab comes courtesy of an HX35 over S400 compound turbo arrangement. The injectors are stock for now-although as we went to press Tyler had a set of 5×18 units from Diesel Auto Power on the way. Along with the normal tweaks (custom fuel plate and AFC adjusted completely forward), the pump benefits from full-cut delivery valves and its timing being set at an aggressive 21 degrees of advancement. The fact that the engine was plucked from a ’96 model year Ram with an NV4500 meant it had the highly sought after 215hp P-pump. “The hardest part of the whole swap was actually getting the A/C lines made, as we couldn’t do that ourselves.” “THE UNWRITTEN RULES OF ENGAGEMENT IN PERFORMING A CUMMINS SWAP DICTATE THAT DURAMAXPOWERED TRUCKS ARE OFF LIMITS.” PUMP WORK “There’s a lot more room between the rear valve cover and the firewall in the Chevy,” Tyler told us. The engine itself rides on factory Dodge/Cummins motor mounts welded to the GM’s frame and, believe it or not, the 5.9L fits better in the Chevy engine bay than it does in a Ram’s. ARP head studs clamp the worked over head to the block.
Cateye duramax full#
Before the head was reinstalled, it was treated to a full port and polish at Outlaw Diesel in Miami, along with 90-ppi valve springs to lower the possibility of valve float or creep. So, the cylinder head was pulled and sent to Haisley Machine for fire-rings and one of its standard thickness fire-ring gasket kits. While the bottom end was left alone, Tyler knew some provisions would have to be made for the head gasket to live at the boost he wanted to run. Sourced from Craigslist, the 120,000-mile 12-valve 5.9L was gone through by Tyler and Felix Aleman of Outlaw Diesel in Miami. In just eight days-and with the help of Outlaw Diesel in Miami-the Duramax/Allison combination was ditched in favor of a compound turbo’d, 12-valve Cummins backed by a built 47RH. Tyler spent his 2016 college Spring Break performing the Cummins swap. Perhaps the wildest part of the entire process was how quickly it all unfolded. Both turbocharger compressor housings, the factory intake elbow, and all intercooler tubes were painted a proprietary blue by Tyler’s friend, Sean Espinosa.Īnd so, the “Chummins,” as Tyler and his group of friends like to refer to it, was born. Its support bracket ties into the passenger side motor mount, which-along with all intercooler tubing-was fabricated by Felix Aleman of Outlaw Diesel in Miami. The first charger to grab a bite of air in Tyler’s compound arrangement is a T6 flanged S475 from BorgWarner. “I had the choice to either fix the issues with the Duramax or-for the same price-I could put a Cummins in the truck and make more power,” he told us. After the LB7’s second set of injectors began to go south and its 350,000-mile head gaskets appeared blown, Tyler got to thinking. The 22-year-old Miami native wasn’t afraid to break all the rules in pursuit of adding reliability and horsepower to his ’03 Silverado. But then there are young guns like Tyler Rabbage.
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