L5P Six Speed Master Rebuild Kit

Shipped approximately 5-8 business days after order is placed.
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What's in the box?

  • Allison L5P triple disc torque converter
  • OE Allison torrington needle bearing kit
  • Paper/Rubber kit
  • OE front pump seal
  • OE stator bushing
  • Thrust washers (2)
  • TransGo shift kit (Included for 2006-10)
  • Pressure regulator spring installation tool
  • RatioTek kit
  • OE late style C3 pistons
  • OE late style C4 pistons
  • OE late style C3 return springs
  • OE late style C4 return springs
  • Passenger-side PTO cover
  • PTO cover gasket
  • ATSG book
  • C1 clutch pack
  • C2 clutch pack
  • C3 clutch pack
  • C4 clutch pack
  • Lightweight cast aluminum Allison 1000 transmission pan
  • Billet aluminum filter lock
  • Genuine Allison transmission filter
  • OE external pan filter
  • Magnetic drain plug
  • Copper sealing ring
  • Pan bolts (15)
  • Pan washers (12)


  • GMC
  • Chevrolet


  • 2017 - 2019


  • 6.6L Duramax L5P


  • Allison 1000 6-Speed


  • This kit is intended for a professional transmission technician who has proper equipment to clean, inspect, test, and rebuild a transmission. Goerend Transmission is not a technical or training service. Customers of this kit are expected to have access to and be proficient with necessary equipment such as scan tools and pressure gauges. This kit does not include every part that may need replacement.
  • To receive the full core deposit back, the core returned to Goerend Transmission must be an unmodified core of the same model of the purchased converter. (Year, Type, Etc.) No part of the core may be rusty/damaged in any way, or you may receive partial to no credit towards your core deposit. When a usable core has been received, the core charge will be refunded to your original form of payment. Call for any questions on what cores are accepted. Make certain your truck is compatible with the parts included in this kit. We design our parts to be compatible with OE specifications. Goerend Transmission is not responsible for damage caused to our parts due to improper installation or other defective, worn, or broken parts.
  • A $15 charge per tab will be applied on returned cores that have broken or missing tabs.