We only use genuine OEM Allison Components throughout the rebuild and no corners are cut on our built transmissions. Replacing the above components offers you peace of mind and a complete, freshly overhauled transmission, it’s LIKE NEW! Failed electrical components can leave your truck dead on the side of the road, we want 100% Satisfaction with your transmission not just today, but in the years to come. On every build the following items are replaced with genuine new Allison parts Torrington bearings, NSBU/ internal mode switch, pressure manifold switch, valve body wire harness seals, valve body solenoids, gaskets, internal filter with billet lock and a genuine Allison external filter with a new magnet. For additional strength on all builds we install a billet sleeve on the factory C2 hub to prevent disengagement and stripped splines. RatioTek and Trans-Go Shift Kit in the valve body and stator to increase clutch holding power, and to ensure reliability at the higher pressures the fluid pump is freshened on 6-speed applications and on 5 speeds the pump is replaced with an upgraded 6-speed style unit. ![]() 2001-2010 model year units are upgraded to OEM LML style C3/C4 clutch apply pistons and return assemblies to allow for faster disengagement of these clutches which allows for quicker, smoother shifts. When reassembly starts we use a Raybestos Clutch Kit (in 750hp and 750+ builds) custom tailored to our specifications. ![]() All parts are washed in our ultrasonic parts washer to ensure a clean, contaminant-free rebuild. All our builds start with a COMPLETE disassembly of the transmission for inspection of all components. ![]() We offer three build levels: 550HP, 750HP, and 750+HP. With over 10 years of combined experience and hundreds of builds in use to date, we have been able to tweak and perfect our builds to get the most out of the Allison to withstand the power that we are able to produce with the Duramax. All WCFab Built Allison Transmissions are assembled in-house in our climate controlled clean room.
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