RAYBESTOS 8L90 Performance Transmission Rebuild Kit - Level 2 (Drop-In Clutch Module, No Added Clutch Capacity)

Picture for representation purposes only - actual contents may vary as we continue to develop our product.

Raybestos GPZ® High-Energy Friction Clutch Pack Module

This rebuild kit includes a premium Raybestos clutch module featuring advanced friction clutch plates built with GPZ® High-Energy fiber technology. These plates are engineered to withstand repeated cycling, extreme heat, and high-stress operating conditions, far beyond what factory parts can handle. The clutch pack dramatically improves the effectiveness and longevity of the 8L90 automatic transmission, helping reduce slip and maintain consistent engagement even under demanding loads. Includes (5) C3 friction plates for vehicles with larger-capacity drums.

Raybestos Steel Clutch Plate Pack

The included steel clutch plate module is designed to enhance shift smoothness and reduce common problems such as shudder, noise, and wear. Raybestos steels are known across the industry for their precision, durability, and ability to maintain consistent pressure during operation. This results in better long-term performance and more stable gear changes across the lifespan of the rebuild. The kit includes (5) C3 steels for larger drum applications when required.

Overhaul Kit

The overhaul kit contains essential automatic transmission parts such as gaskets, seals, and soft components needed for a complete and reliable rebuild. These components restore hydraulic integrity, reduce internal pressure loss, and help eliminate issues that can develop in older or heavily used transmissions. Whether your vehicle is used for commuting, towing, or weekend performance driving, these upgraded parts support smooth operation and long-term durability.

Hi-Per Blue® C1 Piston

The Hi-Per Blue® piston is engineered using advanced Blue AEM material that offers superior resistance to heat, chemicals, and deformation. This improves the piston’s ability to maintain proper seal integrity and clutch apply performance, especially important in the C1 clutch group (1-2-7-8-R). Its precision design enhances the overall effectiveness of the rebuild and supports consistent shift feel over thousands of miles.

GM Transmission Filter

A genuine GM filter is included to maintain proper fluid flow and protect the internal components of your automatic transmission. Clean, unobstructed filtration is essential for protecting friction materials, steels, and hydraulic passages. Installing a new filter during every transmission rebuild helps ensure long-term reliability and smooth operation on the road.

Frequently Asked Questions

What makes this Level 2 Raybestos transmission kit different from other rebuild kits?

This kit features high-quality Raybestos Powertrain components, including GPZ® friction materials and precision steel plates. It’s engineered to enhance durability and shift consistency without modifying clutch capacity, making it ideal for stock and lightly modified vehicles.

Does this kit improve the effectiveness of the 8L90 automatic transmission?

Yes. The upgraded friction clutch plates and steel clutch plates provide noticeably smoother shifts and better heat resistance, which helps stabilize transmission performance over time.

Is this a good option for solving common 8L90 shift issues?

Absolutely. Many builders use this kit to address shudder, slipping, and inconsistent engagement often seen in worn 8L90 units. While not a full shift kit, the improved friction and steel materials help correct many underlying problems.

Does this Level 2 kit include enough parts for a complete rebuild?

Yes. It includes the clutch module, steel module, overhaul kit, Hi-Per Blue® piston, and GM filter—providing the core transmission parts needed for a full service. Only fluid and specialty tools are typically required in addition.

Is this Raybestos brand kit suitable for performance or towing applications?

While Level 2 is designed primarily for OEM-level power, the GPZ® friction materials offer significantly better durability than stock. For heavier towing or higher horsepower builds, Level 3 or Level 4 may be better options, but this kit still provides a meaningful upgrade over factory components.