The Stage4R transmission kit is our intermediate-level trans upgrade kit thats built for drag racing, sled pulling, towing and daily-driving. This kit works well for a stock truck, but was engineered to handle a Duramax engine that's been equipped with multiple high-performance modifications: such as performance tuning, oversize injectors, and/or small nitrous kits.
This kit includes our valve body recalibration kit (recalibration kit does not change shift points, only increases clutch holding power), converter flow valve and upgraded high-friction C1, C2, C3 and C4 clutches.
- Stage 4R Transmission Upgrade Without Converter
- C1, C2, C3, C4 included
- Valve body recalibration kit, boost valve, pump shim and gaskets
- Sold As A Kit
- 2011-2016 GM Allison 1000/2000 Transmissions (128034514)
- Kits vary by quantity, thickness and material based on your specific transmission needs
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