{"product_id":"dfc-diesel-th5904507ausoalbhd-tow-haul-hd-series-auto-speed-of-air-long-block-2004-5-2007-5-9-dodge-cummins","title":"DFC Diesel TH5904507AUSOALBHD Tow\/Haul HD Series Auto Speed Of Air Long Block | 2004.5-2007 Dodge RAM 5.9L Cummins","description":"\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSupports up to 900 horsepower output\u003c\/li\u003e\n\u003cli\u003eIncludes heavy-duty Wagler connecting rods\u003c\/li\u003e\n\u003cli\u003eBalanced rotating assembly for smoother operation\u003c\/li\u003e\n\u003cli\u003eComes with Fluidamper for engine harmonics\u003c\/li\u003e\n\u003cli\u003eIncludes HD flexplate for transmission durability\u003c\/li\u003e\n\u003cli\u003eBuilt for high-power towing and daily driving\u003c\/li\u003e\n\u003cli\u003eMachined using Rottler CNC equipment\u003c\/li\u003e\n\u003cli\u003eFully remanufactured with all new internals\u003c\/li\u003e\n\u003cli\u003eComplete long block including cylinder head\u003c\/li\u003e\n\u003cli\u003ePreset rockers and pushrods for easy install\u003c\/li\u003e\n\u003cli\u003e5-year or 160,000 km limited warranty\u003c\/li\u003e\n\u003cli\u003eBuilt to exceed OEM performance specs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eWhen You Want Big Power And Street Reliability\u003c\/h4\u003e\n\u003cp\u003eIf you’re chasing big numbers without giving up daily drivability, the DFC Tow\/Haul HD Series Long Block for the 2004.5-2007 5.9L Dodge Cummins is the serious upgrade your truck needs. Designed to handle up to 900 horsepower, this engine delivers raw strength while still being reliable enough for regular towing and street use. Whether you’re hauling a toy hauler across states or stacking work miles every week, it’s built to run hard without falling apart. The balanced rotating assembly keeps things smooth under power, while the Wagler connecting rods give you the confidence to turn up the boost. Add in the Fluidamper and HD flexplate, and you’ve got a long block that stays composed under pressure. It’s not just about brute force, either. This build is engineered to be dependable for the long haul, backed by DFC’s trusted 5-year, 160,000 km warranty.\u003c\/p\u003e\n\u003ch4\u003eStrengthened Internals Built To Handle Serious Horsepower\u003c\/h4\u003e\n\u003cp\u003eThe DFC Diesel Tow\/Haul HD Series is built from the ground up to withstand the demands of high horsepower Cummins applications. Every engine begins with a precision-machined block using Rottler CNC equipment to guarantee factory-spec tolerances. It includes a fully remanufactured cylinder head with new valves, guides, and seats, all magnafluxed and resurfaced for lasting reliability. What sets this HD version apart is its heavy-duty internals—Wagler connecting rods, a Fluidamper, an HD flexplate, and a balanced rotating assembly all come standard. These upgrades are key to managing increased power, torque, and engine harmonics when pushing beyond 800 horsepower. This long block retains all the features found in the Street and Tow\/Haul Series, making it a well-rounded solution for both work and performance. Ideal for trucks pulling heavy loads at high horsepower, it offers the balance of race-ready parts and real-world dependability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e Fits: \u003c\/strong\u003e 2004.5, 2005, 2006, 2007 Dodge RAM 5.9L Cummins\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for 2004.5-2007 5.9L Dodge Cummins engines\u003c\/li\u003e\n\u003cli\u003eRated for up to 900 HP (94-98) and 850 HP (98.5-02)\u003c\/li\u003e\n\u003cli\u003eIdeal for trucks towing or driving between 650-800 HP\u003c\/li\u003e\n\u003cli\u003eIncludes all features of the Street and Tow\/Haul Series\u003c\/li\u003e\n\u003cli\u003eWagler connecting rods included for extreme durability\u003c\/li\u003e\n\u003cli\u003eFluidamper and HD flexplate help control engine harmonics\u003c\/li\u003e\n\u003cli\u003eBalanced rotating assembly included for smoother performance\u003c\/li\u003e\n\u003cli\u003eBuilt to handle high power while remaining streetable\u003c\/li\u003e\n\u003cli\u003eRated horsepower measured at the flywheel\u003c\/li\u003e\n\u003cli\u003eMachined using Rottler CNC for precision tolerances\u003c\/li\u003e\n\u003cli\u003eComes with DFC's 5-year or 160,000 km limited warranty\u003c\/li\u003e\n\u003cli\u003eRequires proper tuning and setup for peak performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"884\" data-end=\"931\"\u003eStreet Series vs Tow\/Haul vs Tow\/Haul HD\u003c\/h3\u003e\n\u003cul data-start=\"933\" data-end=\"1398\"\u003e\n\u003cli data-start=\"933\" data-end=\"1099\"\u003e\n\u003cp data-start=\"935\" data-end=\"1099\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003eStreet Series:\u003c\/span\u003e Ideal for daily driving, light work, and diesel enthusiasts. Focuses on reliability upgrades over stock, with head stud and sealing improvements.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1100\" data-end=\"1240\"\u003e\n\u003cp data-start=\"1102\" data-end=\"1240\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003eTow\/Haul Series:\u003c\/span\u003e All Street upgrades plus added performance parts for higher load and towing power. Supports builds up to ~700 HP.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1241\" data-end=\"1398\"\u003e\n\u003cp data-start=\"1243\" data-end=\"1398\"\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eTow\/Haul HD Series:\u003c\/span\u003e The most robust option. Adds heavy-duty internals like Wagler rods and a balanced rotating assembly for 800+ HP capability.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1405\" data-end=\"1445\"\u003eStandard\/Auto vs Standard vs Auto\u003c\/h3\u003e\n\u003cul data-start=\"1447\" data-end=\"1706\"\u003e\n\u003cli data-start=\"1447\" data-end=\"1557\"\u003e\n\u003cp data-start=\"1449\" data-end=\"1557\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003eStandard\/Auto:\u003c\/span\u003e Compatible with both manual and automatic transmissions. Offers the most flexibility.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1558\" data-end=\"1636\"\u003e\n\u003cp data-start=\"1560\" data-end=\"1636\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003eStandard:\u003c\/span\u003e Built specifically for manual transmission configurations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1637\" data-end=\"1706\"\u003e\n\u003cp data-start=\"1639\" data-end=\"1706\"\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eAuto\u003c\/span\u003e: Built specifically for automatic transmission setups.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DFC Diesel","offers":[{"title":"Default Title","offer_id":68060706996497,"sku":"DDU-TH5904507AUSOALBHD","price":20702.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/0477\/1089\/files\/0034631_dfc-long-block-engine-towhaul-series-dodge-59l-cummins-2003-2004_b7c32ca4-5ac1-42b6-9b8d-08ce99a67795.webp?v=1794721856","url":"https:\/\/gautoparts.com\/products\/dfc-diesel-th5904507ausoalbhd-tow-haul-hd-series-auto-speed-of-air-long-block-2004-5-2007-5-9-dodge-cummins","provider":"Guaranteed Auto Parts","version":"1.0","type":"link"}