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.Features:
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
2006-2010 GM Allison 1000/2000 Transmissions (128034513)
Kits vary by quantity, thickness and material based on your specific transmission needs