Fits: 2020 thru 2024 Chevy Silverado/GMC Sierra 2500HD/3500HD L5P Duramax Diesel

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This new High Capacity Allison 10L1000 clutch drum by SunCoast arrives fully assembled for effortless installation. SunCoast's 10L1000 Zero Deflection "E" clutch drum addresses all of the facets affecting the durability of these clutches in highly demanding driving situations. 

To improve clutch life the clutch count is increased. This 10L1000 clutch drum boasts an astounding 29% increase in clutch capacity compared to the factory drum, surpassing any other aftermarket option on the market today by an additional 15%.

Another key point addressed here is the deflection in the E-clutch. This is especially exacerbated when operating under higher line pressures, often experienced during heavy-duty or higher-load situations.

The new SunCoast 10L1000 “patent-pending” E-piston is engineered to eliminate any possibility of apply-deflection or coning. By using superior materials and increasing the apply piston diameter, we have significantly expanded the contact surface area. Crafted from billet T6061 aluminum bar stock and meticulously CNC machined in-house to exact tolerances, this new “E” Drum Apply Piston for the 10L1000 embodies SunCoast's excellence in design.

Moreover, the issue of rapid drum degradation caused by steel tooth chatter/engagement is resolved by designing specialty 4140 steel dowels for the steels to engage with, replacing the highly malleable factory-cast aluminum. This design allows reliability while keeping reciprocating mass at a minimum.

The friction material was also addressed by engineering and design to provide maximum "NVH" for comfort with Raybestos GPZ clutches.

Raybestos Powertrain GPZ friction clutch plates greatly increase transmission performance and durability. This state-of-the-art friction material far exceeds OE material to withstand high stress, high temperatures, and repeated cycling. GPZ's outstanding performance benefits are perfect for heavy-duty vehicles and high-stress driving. Testing of GPZ revolutionary friction material shows that it outperforms OE materials by as much as 20%.

Features:

• 29% more clutch capacity than OEM
• Billet apply piston diameter enlarged to avoid “clutch cone” by contacting more surface area of top steel
• Billet 6061 apply piston ensures minimal deflection
• Patent-pending design made in-house in Florida
• 15% more capacity than any other aftermarket drum
• Steels engage on 4140 steel dowels, instead of the problematic cast aluminum drum assembly