Introducing the XCaliber Black Performance Series Billet P2 Carrier & Billet C2 Hub Set! The stock P2 planetary in Allison 1000 transmissions are prone to stripping out and failing due to poor tuning, high horsepower, heavy towing, and excessive abuse. Stripping out the planetary can cause catastrophic failure, damage more components, and immobilize your vehicle. This BILLET P2/C2 Set for your 5 speed Allison transmission is our go to solution to resolve these issues and keep you on the road. This kit is recommended for horsepower applications above 600 horsepower, sled pulling, drag racing, and heavy duty towing over 10,000 Lbs. This BILLET P2/C2 Set will give you peace in mind in any performance-built Allison transmission.