SUNCOAST CATEGORY 0 10L80 REBUILD KIT, STOCK CLUTCH COUNT

The 10L80 10-speed automatic transmission was co-developed by General Motors and Ford in response to increasingly strict fuel economy and emissions regulations. While both companies implemented their own calibrations, the 10L80 is GM’s version—engineered to handle the demands of modern high-performance and heavy-duty vehicles while delivering smooth shifting and improved fuel efficiency.

Found in vehicles like the Chevrolet Camaro SS, Silverado 1500, GMC Sierra, and Cadillac CTS-V, the 10L80 was built to balance brute strength with refined drivability. This advanced transmission design allows GM’s performance vehicles to maintain higher horsepower at lower RPMs, while maximizing torque transfer and minimizing lag between shifts.

One of the key benefits of the 10-speed design is its ability to keep the engine operating in the optimal power band with minimal RPM drop between gears—similar to the seamless feel of a CVT but with the durability and responsiveness of a traditional automatic. The tight gear spacing also improves off-the-line performance, mid-range acceleration, and highway fuel economy.

To support this balance of power and efficiency, the 10L80 features a wide 7.39 overall gear ratio spread, including a low first gear for aggressive launches and three overdrive gears for cruising efficiency. Whether you're building a boosted street truck, daily-driven performance car, or a high-torque towing setup, this transmission is up to the challenge.

10L80 Transmission Gear Ratios

First – 4.70
Second – 2.99
Third – 2.15
Fourth – 1.80
Fifth – 1.52
Sixth – 1.28
Seventh – 1.00
Eighth – 0.85
Ninth – 0.69
Tenth – 0.64
Reverse – 4.87

Thanks to its tight shift recovery and narrow drop-off between gears, the 10L80 is especially well-suited for engines with narrow powerbands or aggressive cam profiles. Forced induction applications also benefit from this design—enabling the use of larger turbochargers and turbine housings without sacrificing response or performance between shifts.

The 10L80 Rebuild Kit and its contents 

This is a complete clutch and steel module kit designed to fit GM’s 10L80 transmission. Commonly found in vehicles like the Chevrolet Silverado, Camaro SS, GMC Sierra, and Cadillac Escalade, the 10L80 is a 10-speed automatic transmission built to handle high torque and modern performance demands.

The SunCoast upgraded 10L80 rebuild kit includes all the frictions and steels required to refresh or rebuild a stock-capacity unit. This kit features Raybestos GPZ friction plates paired with high-performance steel plates—engineered for improved durability, heat resistance, and smooth power delivery under high-stress driving conditions.

Whether you're maintaining a performance street build or freshening up a high-mileage daily driver, this kit is ideal for re-clutching stock 10L80 applications with enhanced materials that exceed OE quality.

The Clutches 

Raybestos Powertrain GPZ friction plates greatly increase transmission performance and durability. This state-of-the-art friction material far exceeds OE material to withstand high stress, high temperatures and repeated cycling. GPZ's outstanding performance benefits are perfect for heavy-duty vehicles and high-stress driving. Testing of GPZ revolutionary friction material shows that it outperforms OE materials by as much as 20%. Plus, its performance improves as the power increases.

Advantages:

• Withstands high horsepower
• Greater torque capacity
• Maintains piston travel
• Optimum performance
• Higher heat resistance
• Smooth engagements
• Enhanced shift feel