Category 4 HP Custom Allison Rebuild Kit with Torque

The Suncoast Converters GM Allison CAT 4 950+ HP Rebuild Kit is engineered for serious performance applications, specifically for GM Duramax LB7/LLY engines paired with Allison 1000 and 2000 Series transmissions. This comprehensive kit includes a high-performance torque converter and an SFI 29.3 certified billet flexplate, along with a full overhaul and clutch kit. It also includes redesigned apply pistons with improved rubber compounds for higher heat tolerance and a custom apply plate that enhances friction lubrication. The input shaft is manufactured from 9310 Vacumelt steel for over 50% increased torsional fatigue strength, while the intermediate and output shafts are made from robust 300M billet steel. A new internal wiring harness and a billet C2 clutch hub are also included to enhance durability and reliability under extreme conditions. This rebuild kit is ideal for applications involving heavy towing, sled pulling, and racing, significantly upgrading the factory-rated 400 horsepower capacity of the Allison 1000/2000 Series transmissions. The included torque converter is manufactured in-house with customizable stall speeds and torque multiplication, featuring a heavy-duty forged billet steel cover and superior lock-up performance. The one-piece billet flexplate replaces the weaker factory unit and is SFI certified, crucial for high-torque applications and racing requirements. This kit is compatible with 2001-2006 Chevrolet Silverado 2500, 2001-2006 Chevrolet Silverado 3500, 2001-2006 GMC Sierra 2500, and 2001-2006 GMC Sierra 3500 models equipped with LB7/LLY Duramax engines.