Spool Performance - 8HP45, 8HP50, 8HP51 Stage 2 Upgraded Transmission DIY Parts Kit

Spool Performance Stage 2 Transmission Kit for 8HP45, 8HP50, and 8HP51

After over a year of rigorous testing and development, Spool Performance proudly presents the Stage 2 Transmission Kit for ZF 8HP45, 8HP50, and 8HP51 transmissions. Built to overcome the limitations of OEM components, this kit supports over 1000 ft-lbs of torque—perfect for high-performance builds demanding both strength and reliability.

🛠️ Key Performance Upgrades:

Advanced Friction Materials – FX-RT

• Developed in-house for maximum torque capacity

• Delivers a higher friction coefficient than OEM for faster, firmer shifts

• Maintains excellent engagement and drivability

Billet 7075 C & E Hubs

• OEM cast A380 aluminum hubs are prone to shearing or spline failure

• Replaced with heat-treated, hard-anodized 7075 billet aluminum for superior strength

• Improved design enables better cooling, oil evacuation, and long-term durability

Increased Clutch Pack Capacity

• More clutch discs in every clutch pack for greater torque handling

• Custom pressure and apply plates ensure even wear and reliable engagement

• Each pack is pre-clearanced—no guesswork, just drop in and go

🔧 Installation Made Easy

• All clutch packs are pre-clearanced for direct install

• Includes extra steels for custom builders who prefer tailored clearances

• Designed to minimize downtime and maximize builder confidence

✅ What's Included:

• 7075 Custom Billet E Hub

• E Hub Center Bushing

• 7075 Custom Billet C Hub

• A, B, C, D, E Clutch Friction & Steel Packs

• A, B, C, D, E Pressure & Apply Plates

📦 Complete with all components needed to fully upgrade every clutch pack.

Spool Performance Billet Aluminum Transmission Oil Pan – ZF 8HP

Designed to complement your high-performance transmission build, the Spool Performance Billet Aluminum Oil Pan offers superior cooling, durability, and fluid capacity—a critical upgrade for long-term reliability.

🔍 Key Benefits:

• Increased Fluid Capacity
  Extra oil volume keeps temperatures stable under load, reducing wear and improving longevity.

• Improved Thermal Management
  Billet aluminum dissipates heat far better than plastic or stamped steel pans, keeping transmission temps in check under hard driving.

• Built to Last
  Resists cracking, warping, and road debris impacts—ideal for both street and track environments.

• Perfect Fitment
  Precision-machined for a direct bolt-on replacement on all ZF 8HP transmissions. No modifications required.

🏁 Why Spool Performance?

With our Stage 2 kits and billet oil pans, your 8HP45/50/51 transmission is equipped to handle serious horsepower with OEM-like drivability. Whether you're daily driving or pushing limits at the track, Spool Performance gives you confidence, capability, and unmatched quality.