SunCoast A1-P2K Allison P2 Panel | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Features:

• Fits 2001–2005 GM 2500HD and 3500HD Duramax
• Includes precision-machined P2 planet gear
• Designed to accept SunCoast billet P2 hub
• Machine work required on P1 sun gear
• C2 clutch hub sleeve and washer included
• Improves reliability of Allison transmission internals
• Ideal for high performance or heavy-duty use
• Does not include C2 clutch hub (sold separately)
• Core deposit required if pre-shipped
• Core must be buildable for deposit refund
• Recommended during transmission rebuild or upgrade

Give Your Allison A Fighting Chance Under Load

If you're pushing your 2001–2005 Duramax-powered Silverado or Sierra hard, the transmission better be up to the task. That’s where the SunCoast A1-P2K Allison P2 Panel steps in to reinforce one of the most failure-prone components under serious power. Built to accept SunCoast’s billet P2 hub, this machined P2 planet gear adds strength right where your Allison needs it most. Whether you're towing, racing, or just building a bulletproof rig, this kit brings durability and long-term peace of mind. It’s designed for those who want to get ahead of the problem before it sidelines their truck. With smart upgrades like this, you're not just replacing parts, you're eliminating weak links. If you're already rebuilding your trans, adding this fix is a no-brainer that pays off in reliability for years to come.

Designed For Proper Fitment With High Strength Support

The SunCoast A1-P2K kit is engineered to resolve a common failure point in Allison 1000 transmissions found in 2001–2005 GM 2500HD and 3500HD trucks. It includes a machined P2 planet designed to pair with a billet P2 hub for improved strength and torque handling. Installation will require precision machining on the P1 sun gear as well as integration of a C2 clutch hub sleeve and washer, both of which are included. The C2 clutch hub itself is sold separately under part number 29536962 and should be replaced if worn or damaged. This kit is an ideal solution during a transmission overhaul, especially for high-horsepower or heavy-duty applications. A core charge applies if you're receiving the part ahead of time, and SunCoast requires that the core be buildable in order to receive a refund. By addressing this weak point, the A1-P2K kit improves reliability and maintains gear train alignment under high-stress conditions. It’s the kind of forward-thinking upgrade that serious builders rely on.

Fits: 2001, 2002, 2003, 2004, 2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Notes:

• Machined P2 planet is designed to accept SunCoast’s billet P2 hub.
• Machine work is required on the P1 sun gear for proper installation.
• Includes C2 clutch hub sleeve and washer in the kit.
• C2 clutch hub is not included, sold separately under part# 29536962.
• Kit is designed to reinforce common failure points in Allison transmissions.
• Core deposit is required if shipped prior to core return.
• Core must be buildable in order to receive core deposit refund.
• Recommended for high-horsepower, towing, and race applications.
• Installation should be performed by a transmission specialist or experienced builder.