SunCoast A1-P1B-6 Modified P1 Sun Gear | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SunCoast A1-P1B-6 Modified P1 Sun Gear | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Manufacturer: SunCoast Performance

SKU: SUNA1-P1B-6
Sale price
$82.45
Regular price
$130
You save
37%
Ships From Manufacturer in 3-5 Days
American Express
Apple Pay
Diners Club
Discover
Google Pay
Mastercard
PayPal
Shop Pay
Venmo
Visa

Features:

  • Modified for increased torque capacity
  • Built for Allison 1000 transmissions
  • Fits 2001–2010 Duramax-powered GM trucks
  • Improves gear engagement and durability
  • Made from heat-treated steel
  • Reduces internal stress under heavy load
  • Ideal for tuned or workhorse applications
  • Engineered for high-performance builds
  • Precision-machined for consistent fitment
  • Enhances overall transmission reliability
  • Backed by trusted SunCoast craftsmanship

A Smarter Upgrade for Hard-Working Duramax Trucks

When you’re pushing your Allison transmission harder than stock, every component inside starts to matter a whole lot more. The SunCoast A1-P1B-6 Modified P1 Sun Gear is designed to give your 2001 to 2010 Silverado or Sierra HD the reinforcement it needs at the heart of the transmission. Whether your truck is tuned for extra power or works every day under heavy loads, this upgraded sun gear helps ensure the system can hold up under pressure. It’s made from heat-treated steel and machined to tight tolerances, so it handles torque more effectively and lasts longer than a factory part ever could. You won’t see it from the outside, but this is the kind of internal upgrade that pays off every mile.

Built to Take the Abuse, Not Just Look Good on Paper

SunCoast isn’t in the business of copy-and-paste parts. This gear was developed with real-world durability in mind, based on feedback from truck owners who expect more from their drivetrain. The modified design helps reduce internal stress during aggressive shifts or prolonged towing, which means less wear across the entire gear set. It fits directly into the Allison 1000 transmission without modification, so you can drop it in with confidence. If you're building a reliable rig that’s going to handle tough jobs or high power levels, the A1-P1B-6 is a smart way to strengthen the core without overcomplicating your build. It's one of those upgrades that may not be flashy, but it’s definitely the kind you’ll be glad you made.

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

Year Ranges Make Model Series Engine
2001-2010 GM/Chevrolet/GMC Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7/6.6L Duramax LBZ/6.6L Duramax LLY/6.6L Duramax LMM
Property Values
Year Ranges 2001-2010
Make GM/Chevrolet/GMC
Model Silverado/Sierra
Series 2500HD/3500HD
Engine 6.6L Duramax LB7/6.6L Duramax LBZ/6.6L Duramax LLY/6.6L Duramax LMM

Call a Diesel Expert – We're Here to Help You Find the Right Fit!

Give us a call:+1-208-719-7400