Spool Performance 8HP45, 8HP50, 8HP51 Stage 2 Upgraded Transmission - Build at Spool Performance HQ SP-8hp50-BAS

Take your drivetrain to the next level with the Spool Performance Stage 2 Upgraded Transmission Build for ZF 8HP45, 8HP50, and 8HP51—a complete performance overhaul that transforms your factory transmission into a high-torque, track-ready powerhouse. Built in-house at Spool Performance HQ, this upgraded transmission is engineered to deliver unmatched strength, durability, and performance under extreme conditions, all while preserving drivability for street use.

This service includes both parts and professional assembly of your transmission using Spool’s proprietary Stage 2 upgrade components. Every build starts with a core ZF 8HP45/50/51 transmission in good working condition. Should your core require additional repairs, a full inspection will be provided and any damaged components will be itemized separately.

With a torque capacity rated at over 1000 ft-lbs, the Stage 2 transmission utilizes heat-treated, hard-anodized billet 7075 C and E hubs, custom pressure and apply plates, FX-RT proprietary friction materials, and increased clutch packs—all of which are precision-engineered to correct known OEM weaknesses and provide significantly greater torque-handling capacity.

To complement this build, Spool includes its Billet Aluminum 8HP Transmission Oil Pan, designed for superior thermal management, increased oil capacity, and long-term durability. Crafted from solid billet aluminum, it improves oil cooling and helps maintain transmission temperatures under load, ideal for both spirited street driving and high-performance track use.

Whether you're building a street monster or a drag-strip warrior, the Spool Performance Stage 2 Transmission Build is the definitive solution for maximizing the performance and longevity of your ZF 8HP transmission.

Key Features:

• Complete Stage 2 Build – Includes labor and all proprietary internal upgrade components.

• Over 1000 ft-lb Torque Capacity – Ideal for high-horsepower applications.

• 7075 Billet C & E Hubs – Heat-treated and anodized for maximum strength and resistance to spline failure.

• FX-RT Friction Materials – In-house developed friction plates with increased coefficient for improved grip and durability.

• Increased Clutch Packs – Enhanced holding power across all clutch stages.

• Custom Pressure & Apply Plates – Optimized for performance, engagement quality, and ease of installation.

• Billet 8HP Oil Pan – Improved oil capacity, heat dissipation, and structural integrity vs. OEM pans.

• Built by Experts at Spool HQ – All builds are handled by trained professionals to ensure quality and reliability.

• Transparent Core Process – Core inspections are conducted in-house and any additional repair needs are fully disclosed.

Fitment:

• ZF 8HP45 / 8HP50 / 8HP51 Automatic Transmissions

• BMW and other applications utilizing these ZF transmission variants (e.g., BMW B58 and N55 platforms, including G20 M340i, G30 540i, G01 X3 M40i, Toyota Supra A90/A91, and more)

• Please verify compatibility with your vehicle before ordering.

What’s Included:

• Custom Billet 7075 E Hub + Center Bushing

• Custom Billet 7075 C Hub

• A, B, C, D, and E Clutch Frictions, Steels, Apply and Pressure Plates

• FX-RT Friction Discs

• Spool Billet Aluminum 8HP Transmission Oil Pan

• Full Labor for Assembly at Spool Performance HQ

Shipping Information:

• Core must be shipped to Spool HQ at the customer’s expense. Return freight also to be arranged by the customer.

• For shipping support, Contact the office for assistance if needed.

Elevate your transmission's capabilities with the Spool Performance Stage 2 ZF 8HP Build—designed for enthusiasts who demand precision, strength, and uncompromising performance.

Note: 'New' merchandise may be returned for exchange or refund within 15 days from the date of shipment. 'New' merchandise must be unused and free from installation or mounting damage. Installation or modification of parts waives your right to returns, refunds, or exchanges.