After over a year of rigorous testing, Spool Performance proudly presents our Stage 2 Transmission Kits for the 8HP45, 8HP50, and 8HP51 series transmissions. Engineered to surpass the limitations of stock components, these kits deliver an exceptional torque capacity of over 1000 ft-lbs. This comprehensive upgrade features advanced friction materials developed in-house, billet 7075 heat-treated and hard-anodized custom-designed C and E hubs, bespoke pressure plates, apply plates, and increased clutch counts for every clutch pack.

Advanced Hub Design

The C and E clutch hubs in the 8HP series are critical points of failure due to their OEM construction from weak, cast A380 aluminum. These components are prone to shearing or breaking of the lock splines, and the steel clutch plates can dig into the splines, causing hang-ups and burnouts.

Key Upgrades:

• Material: Re-engineered using 7075 series aluminum, one of the highest grades of billet aluminum.
• Treatment: Heat-treated and hard-anodized to enhance strength and surface hardness, providing superior resistance to shear forces and wear from steel disc engagement.
• Design Enhancements: Improved clutch cooling paths, oil evacuation, and increased clutch pack area for optimized performance.

Superior Friction Materials

Our FX-RT frictions, developed in-house, offer significantly higher friction coefficients than OEM materials. These frictions ensure performance and durability without compromising engagement and overall drivability. This development is the culmination of over a year of continuous testing and refinement across multiple platforms.

Ease of Installation

We understand that rebuilding a transmission can be intimidating, which is why we've designed our kits for seamless installation. All clutch packs are pre-clearanced and ready to drop in with custom pressure and apply plates, eliminating guesswork for the installer. Additionally, the kit includes extra steel plates for builders who prefer custom clearance settings.

Features

• Upgraded Friction Materials: In-house developed for higher friction coefficients and enhanced durability.
• Billet 7075 Hubs: Heat-treated and hard-anodized for superior strength and wear resistance.
• Custom Pressure and Apply Plates: Ensure optimal performance and ease of installation.
• Increased Clutch Counts: Enhanced torque handling capacity for every clutch pack.
• Pre-clearanced Clutch Packs: Ready to install with no need for additional adjustments.
• Extra Steel Plates: Provided for custom clearance settings.

What's Included

• 7075 Custom Billet E hub
• E hub Center Bushing
• 7075 Custom Billet C Hub
• A Clutch Friction & Steels
• A Clutch Pressure Plate
• A Clutch Apply Plate
• B Clutch Friction & Steels
• B Clutch Pressure Plate
• B Clutch Apply Plate
• C Clutch Friction & Steels
• C Clutch Pressure Plate
• D Clutch Friction & Steels
• D Clutch Pressure Plate
• D Clutch Apply Plate
• E Clutch Friction & Steels
• E Clutch Pressure Plate

Recommended Transmission Fluid: AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid (Blue Cap)