ALTO 8L90 Performance Transmission Clutch & Steel Modules (Added Clutch Capacity)
If you’re upgrading or rebuilding your 8L90 transmission, Alto clutches are one of the most trusted options on the market. Designed with advanced G3® friction technology and precision steel plates, these clutch packs deliver durability, heat resistance, and smoother engagement. Whether you’re performing a stock rebuild or seeking performance upgrades, our full line of Alto clutch packs ensures you get the reliability and strength your build requires. FREE UPS Ground to the contiguous United States (lower 48)
In stock items ship within 1-2 business days.
Picture for representation purposes only. Actual contents may vary as we continue to develop our products.
Why Choose Alto Clutches?
- Proven Performance: Trusted worldwide for their heat resistance and longevity.
- G3® Friction Technology: Specially engineered material that minimizes wear under stress.
- Better Heat Dissipation: Thicker steels prevent warpage, ensuring consistent performance.
- Flexible Options: Available in OEM-style packs or CDT-modified performance packs that increase clutch capacity.
- Perfect for 8L90 Builds: Whether stock or performance-focused, Alto clutches handle the power.
8L90 Clutch Pack Options
Below is a breakdown of the most popular Alto clutch packs for the 8L90 transmission.
C1 – 1-2-7-8-R OEM Clutch Pack
- (4) Clutches
- (3) Steel Plates (thicker steels for improved cooling and durability)
- (1) Wave Plate
- (1) Apply Plate
- (1) Backing Plate
This is GM’s latest OEM clutch pack design featuring thicker steels to reduce heat and warpage during high-performance use.
C2 – 1-2-3-4-5-R OEM Clutch Pack
- (3) Clutches
- (2) Steel Plates
- (1) Apply Plate
Provides reliable stock clutch capacity, ideal for standard rebuilds and daily driving.
C3 – 1-3-5-6-7 CDT Modified Alto Power Pack
- (6) Alto G3® Friction Plates
- (7) Steel Plates (varying thicknesses)
- (1) Backing Plate
Adds an additional clutch to either a 4-clutch or 5-clutch drum. Built with G3® friction material for maximum heat resistance and minimal wear. Perfect for drivers looking for extra holding capacity.
C4 – 2-3-4-6-8 CDT Modified Alto Power Pack
- (6) Alto G3® Friction Plates
- (7) Steel Plates (varying thicknesses)
- (1) Apply Plate
- (1) Backing Plate
This pack allows you to add one extra friction with the wave plate retained, or two extra frictions by omitting the wave plate. Offers excellent durability under heavy loads.
C5 – 4-5-6-7-8-R CDT Modified Alto Power Pack
- (5) Alto G3® Friction Plates
- (6) Steel Plates (varying thicknesses)
- (1) Backing Plate
- (1) Snap Ring
Increases capacity by adding one additional clutch and steel while still retaining the factory wave plate. Ideal for performance builds requiring greater torque capacity.
Installation and Support
Each Alto clutch pack includes basic installation instructions. However, if you are inexperienced with the 8L90 transmission, we strongly recommend purchasing a Service Manual for step-by-step guidance. A complete manual is also available through us.
Benefits of Upgrading with Alto Clutches
- Extended Transmission Life: Designed to handle high stress and prevent premature wear.
- Performance Gains: Additional clutch capacity helps deliver smoother, stronger shifts.
- OEM and Beyond: Options available for both stock rebuilds and high-performance modifications.
- Trusted Brand: Alto clutches are recognized by transmission professionals worldwide.
Frequently Asked Questions About Alto Clutches
Are Alto clutches compatible with all 8L90 transmissions?
Yes. Alto clutches are engineered to fit the 8L90 transmission across GM applications, including performance cars and trucks. Depending on your goals, you can choose OEM replacement packs or CDT-modified Alto Power Packs for added clutch capacity.
What makes Alto G3® friction plates different from standard clutches?
Alto’s G3® friction material is designed to withstand higher heat and pressure than standard clutches. This specialized material minimizes wear during high-load shifts, making it ideal for towing, racing, or other performance-oriented applications.
Do I need to retain the wave plate when installing Alto Power Packs?
That depends on the clutch pack. For example, the C4 Alto Power Pack can be configured to retain the wave plate for one additional friction or omit it for two extra frictions. The choice comes down to whether you want a smoother factory-like feel or maximum holding capacity.
Can Alto clutches improve shift quality in a stock rebuild?
Yes. Even in stock rebuilds, Alto clutches provide smoother, more consistent shifts thanks to their improved heat dissipation and advanced friction technology. Many rebuilders notice stronger engagement and reduced flare compared to OEM clutches.
Are Alto clutches recommended for high-horsepower builds?
Absolutely. Alto clutches are widely used in high-horsepower 8L90 builds because they add clutch capacity, resist heat-related warpage, and maintain consistent performance under heavy loads. CDT-modified Alto Power Packs are especially popular for performance upgrades.
