99-16 GM 6.6L Duramax WP Dev 1000HP Allison Transmission

Please note: A 5% cancellation fee will be charged for canceled WP Developments transmissions after purchase.
If lead time is a concern, please contact us BEFORE making your purchase to avoid a cancellation fee. 

WPD 1000hp 5/6 speed Allison 1000 Features
For 1999-2016 GM 2500, GM 3500 Pickup trucks only
100HP rated Allison ready to get put to work will include:

• New bearings throughout
• LML style C3/C4 pistons and springs
• New bonded pistons
• Upgraded WPD Pump
• Upgraded WPD Valve body 
• New internal wiring harness 
• Test pressure switches
• Test shift solenoids
• Added C3 clutches with oiling modification
• Billet C2 hub
• Triple disk custom stall converter 
• Billet input shaft 
• Billet Output shaft
• Billet P2 planetary

WP Developments transmissions proudly carry a 2 year parts warranty.
For further details on the warranty, please view the warranty page- Click here

Warranty Disclaimer
By purchasing this product, you acknowledge and agree that the transmission selected is appropriately rated for your vehicle’s current power level. Exceeding the advertised power rating of the transmission will void the warranty in its entirety. You accept full responsibility for any resulting product failure or damage due to overpowering the unit and accept full responsibility for any associated costs or consequences. Additionally, all TCM calibrations must be certified by WP-Developments to maintain warranty coverage.

WP Developments: WPD 1000HP 5/6 Speed Allison 1000