SUNCOAST CATEGORY 1 10L80 REBUILD KIT, STOCK CLUTCH COUNTS, GASKETS AND FILTER

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.

This 10R80 transmission has a newly designed filter has two types of media, fine and course (medium). The course media is common in most filters (orange filter paper), the fine media filtration (White paper) is the newer material. There is a thermal plate inside the filter that separates the course and fine media. When the oil is colder (higher viscosity) at startup, The fluid will flow through both the fine and course filter media.

As the fluid heats up (less viscosity) , the thermal plate will bend and restrict the coarse media section; directing most of the fluid through the fine media. Therefore catching more of the finer debris once the fluid is heated giving it a far superior filtration system.

This new Suncoast 10R80 rebuild kit comes with a new factory filter to ensure zero flow issues.

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

The 10L80 Rebuild Kit and its contents 

This is a complete clutch and steel module kit that fits the new GM 10L80 Transmission. This module kit contains all of the clutches and steels necessary to rebuild your 10L80 transmission. The GM 10L80 transmission comes standard in the Chevrolet Silverado, Camaro and the GMC Denali.

This Suncoast upgraded 10L80 transmission rebuild kit comes with new Raybestos GPZ clutches, steels, factory OEM filter and high performance overhaul kit.

This Suncoast 10L80 rebuild kit contains all the frictions and steels you will to do a clutch and steel replacement on a 10L80 transmission containing a stock count clutches and steels. This 10L80 rebuild kit was designed to be a re-clutch for a stock capacity unit utilizing the Raybestos GPZ paper and high performance steels.