Modified P1 Sun Gear

Features:

• Modified for improved torque handling
• Precision-machined for tighter tolerances
• Supports high-horsepower diesel applications
• Reduces gear flex under heavy load
• Compatible with Allison 1000 transmissions
• Direct fit for 2001–2010 Duramax trucks
• Improves power transfer efficiency
• Made from premium-grade steel
• Engineered to reduce internal wear
• Built for demanding towing conditions
• Backed by SunCoast's proven reliability
• Trusted upgrade for performance builds

Designed for Trucks That Don’t Take It Easy

When you're working your Duramax hard or squeezing out every bit of horsepower from your build, stock transmission parts can start to show their limits. That’s where the SunCoast A1-P1B-5 Modified P1 Sun Gear comes into play. This isn’t just a replacement—it’s an upgrade built for real-world performance. Whether you're towing a trailer full of equipment, running a tuned setup, or just want peace of mind on long hauls, this gear is built to hold up under serious load. SunCoast has taken the time to refine this part with tighter tolerances and upgraded materials, giving it the strength to handle the increased torque demands that come with diesel performance. It’s a small part that plays a big role in keeping your transmission running smooth and strong.

Built with Purpose, Backed by Experience

This gear is designed specifically for 2001 to 2010 GM Silverado and Sierra 2500HD and 3500HD models with the 6.6L Duramax and Allison 1000 transmission. It drops right in, no guesswork needed, and immediately gives you added confidence in your drivetrain. The modified design helps minimize flex and internal stress during operation, which not only improves reliability but also helps reduce premature wear on other components in the system. SunCoast doesn’t just build parts—they listen to what diesel truck owners actually need, then engineer solutions that hold up to real-life demands. If you're serious about your truck's performance and longevity, upgrading your P1 sun gear is one of those behind-the-scenes moves that makes a big difference over time.

Fits: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax