Spool Performance Stage 2 DIY Transmission Kit for Dodge 8HP70 / 8HP75

Description

*Kit on Backorder- Please email customer_service@spoolperformance.us for latest availability information. Thank you!* Spool Performance Stage 2 Transmission Kit for Dodge 8HP70 & 8HP75 After over a year of rigorous engineering and validation, Spool Performance proudly introduces the Stage 2 Transmission Upgrade Kit for the Dodge 8HP70 and 8HP75 platforms. Designed to far exceed the limitations of factory components, this kit delivers well over 1200 ft-lbs of torque capacity while retaining excellent drivability and shift quality. This upgrade lets you hold way more torque than a stock 8hp90 from a hellcat reliably without having to go through the struggles of programming and swapping transmissions and is good for upwards of 1200whp. Each kit features our in-house–developed FX-RT friction system , billet 7075-T6 heat-treated and hard-anodized C and E hubs , redesigned pressure and apply plates, and increased clutch counts across every clutch pack for unmatched clamping force and thermal stability. This package transforms the 8HP70/75 into a transmission capable of handling the abuse of high-boost HEMI builds, drag launches, and elevated power levels. Advanced Billet Hub Engineering The OEM C and E hubs in the 8HP series are made from weak cast A380 aluminum and are well-known failure points in tuned Dodge vehicles. Under high torque, these hubs frequently experience: • Spline shearing • Cracking at the locking features • Steel plates digging into the soft aluminum, causing binding, slip, or total burnout Key Spool Hub Upgrades • Material Upgrade: Manufactured from aerospace-grade 7075-T6 billet aluminum , offering near-steel strength at a fraction of the weight . • Treatment: Heat-treated and hard-anodized , dramatically improving surface hardness, wear resistance, and long-term spline integrity. • Design Enhancements: • Optimized clutch cooling paths • Faster oil evacuation • Increased clutch contact area • Reduced rotating mass for sharper shift response These improvements eliminate the weak points of the OEM hubs while significantly enhancing performance under sustained high load. FX-RT High-Coefficient Frictions + Increased Clutch Counts Our FX-RT friction technology , originally engineered for the highest-torque Mercedes 9G and BMW 8HP platforms, is now optimized for the Dodge 8HP70/75. These friction materials deliver: • Considerably higher friction coefficients than OEM • Superior thermal resistance under repeated high-load shifts • Stable, consistent engagement without harshness • Exceptional durability on boosted, nitrous, and high-RPM HEMI builds Each clutch pack — A, B, C, D, and E — receives increased clutch counts , providing more friction interfaces for greater torque handling and cooler operating temperatures. This combination of FX-RT materials and added clutch capacity results in a transmission that can confidently hold torque levels well beyond the capability of a stock 8HP70/75. DIY-Friendly Installation Transmission building can seem intimidating, so we engineered this kit for true DIY accessibility: • All clutch packs arrive pre-clearanced and ready to install . • Custom pressure and apply plates eliminate measurement guesswork. • Includes extra steel plates for builders who want to fine-tune clutch pack clearance or shift feel. • No machining or specialty modifications required. • 100% drop-in compatibility with Dodge 8HP70 and 8HP75 units. If you can rebuild a modern automatic, you can install this kit confidently. Features Overview • FX-RT High-Coefficient Frictions: In-house developed, high-energy material for maximum holding power. • Billet 7075-T6 Hubs: Heat-treated and hard-anodized for superior strength, rigidity, and wear resistance. • Increased Clutch Counts: Every clutch pack receives added frictions and steels for enhanced torque capacity. • Custom Pressure & Apply Plates: Provide optimized clamping force and ideal shift characteristics. • Pre-Clearanced Clutch Packs: Ready to install, eliminating setup guesswork. • Extra Steel Plates: Included for optional custom clearance adjustments. What’s Included • 7075 Billet E Hub • E Hub Center Bushing • 7075 Billet C Hub • A Clutch : Frictions, Steels, Pressure Plate, Apply Plate • B Clutch : Frictions, Steels, Pressure Plate, Apply Plate • C Clutch : Frictions, Steels, Pressure Plate • D Clutch : Frictions, Steels, Pressure Plate, Apply Plate • E Clutch : Frictions, Steels, Pressure Plate • Complete Seal Kit (Gaskets + O-rings) Recommended Fluid AMSOIL Signature Series Fuel-Efficient 100% Synthetic ATF (Blue Cap) Ideal for high-performance 8HP builds requiring superior thermal stability. Compatibility: Dodge / RAM / Jeep / Chrysler 8HP70 & 8HP75 Platforms Dodge • Charger R/T 5.7 • Charger Scat Pack / SRT 392 6.4 • Challenger R/T 5.7 • Challenger Scat Pack / SRT 392 6.4 • Durango R/T 5.7 • Durango SRT / 6.4L RAM • Ram 1500 5.7 (DT, 8HP75) • Ram 1500 3.0 EcoDiesel • Ram 2500 / 3500 6.4 (8HP75-LCV) Jeep • Grand Cherokee 5.7 • Grand Cherokee SRT 6.4 • Grand Cherokee 3.0 EcoDiesel • Wrangler 392 6.4 • Wagoneer / Grand Wagoneer (8HP75 variants) Chrysler • 300C 5.7 • 300 SRT 6.4

Specifications