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Stage4 Transmission Upgrade Kit - GM Allison

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As low as $1,199.99

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to Contiguous 48 United States

Have Questions? 714-985-4825

50 State Legal50 States Emissions Legal (E.O. D-701-18)

PPE’s Stage4 transmission kit is our entry-level kit that’s perfect for drag racing, sled pulling, towing or even daily driven use. This kit works extremely well for a stock truck but was engineered to handle a Duramax engine that has been equipped with multiple high performance modifications, such as performance chips, oversize injectors, and/or small nitrous kits.

This kit includes PPE’s triple clutch converter, 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 with Kolene steels.

NOTE: A $200 converter core charge is included in price if bought with converter, reimbursed upon return of good core components to PPE. PPE product finish will vary.

Choose your Application Year and Converter Option

  • 2001-2004 No Converter - 128034201
  • 2001-2004 BC Converter - 128034001
  • 2001-2004 BCBS Converter - 128034301
  • 2004.5-2005 No Converter - 128034202
  • 2004.5-2005 BC Converter - 128034002
  • 2004.5-2005 BCBS Converter - 128034302
  • 2006-2010 No Converter - 128034203
  • 2006-2010 BC Converter - 128034003
  • 2006-2010 BCBS Converter - 128034303

Installation Guide: Stage4-5-6 Trans_Install_v23B.pdf


  • Billet triple clutch converter: "BC" Billet Cover (standard) "BCBS" Billet Cover Billet Stator (optional)
  • C1, C2, C3, C4 included
  • Valve body recalibration kit, boost valve, pump shim and gaskets
Kits vary by quantity, thickness and material based on your specific transmission needs. Call to discuss your transmission project to ensure you get the most from your build.
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