8L90

The 8L90E transmission, also referred to as the 8L90, is a high-performance, eight-speed automatic transmission originally developed by General Motors (GM). Designed for modern rear-wheel-drive and performance vehicles, the 8L90 offers exceptional strength, precision, and efficiency.

At Gearstar, we specialize in custom-building and upgrading GM transmissions like the 8L90E to meet exact performance standards. Each custom-built 8L90E transmission includes a compatible controller to ensure optimal shift performance and seamless integration with specific engine setups. From high-horsepower street cars to track-ready builds, Gearstar’s 8L90E units are engineered for serious performance.

Basics About the 8L90E Transmission

Introduced by GM in 2014, the 8L90 transmission was developed to handle the growing demands of high-torque engines while maintaining smooth drivability. It replaced the 6L90 in many applications, bringing two additional gears for improved acceleration and efficiency.

The 8L90E features a compact, lightweight die cast aluminum case with a bell integrated design, where the bell is an essential component of the main case construction.

Key Features of the 8L90 Transmission

Advanced 8-Speed Design

The 8L90 transmission provides eight forward gears and one reverse, offering a wide gear ratio spread that enhances both acceleration and fuel efficiency. The 8L90 transmission features a 4.56 first gear, which delivers strong take-off performance and quick initial acceleration.

The smaller ratio steps between gears keep the engine in its optimal power band, providing smooth, seamless performance across all speeds. The optimized gear ratios also contribute to superior cruising efficiency at highway speeds.

Lightweight Yet Strong Construction

Despite its strength, the 8L90E is lighter than previous generations thanks to the use of advanced aluminum alloys and precision-engineered internals. The 8L90E transmission weighs approximately 195 pounds, and this reduced weight not only enhances overall vehicle performance but also improves handling and power delivery compared to older, heavier models. This design reduces rotating mass, resulting in faster shifts and improved efficiency without compromising durability.

High Torque Capacity

The 8L90E transmission is built to handle serious power, up to 700 horsepower in upgraded configurations. Its internal components, including a robust clutch system and reinforced planetary gearsets, are complemented by a strong, durable shaft designed to withstand increased load and stress in high-performance or heavy-duty applications, making it ideal for both high-performance street cars and heavy-duty trucks.

Integrated TCM and Efficient Cooling

Unlike older models, the 8L90E features an integrated transmission control module and advanced cooling circuits. This allows for more accurate control, better heat management, and improved reliability under extreme conditions, which is especially important for towing or racing.

Adaptive Shift Technology

The electronic controls in the 8L90 transmission constantly learn and adapt to driving behavior, adjusting line pressure and shift timing to match performance demands. The 8L90 transmission uses advanced solenoids, including variable force solenoids, to precisely control clutch engagement and enhance shift quality for a smoother driving experience. This makes it both efficient during daily driving and aggressive when power is required.

Advantages of the 8L90E Transmission

Superior Performance

The 8L90E’s gear ratios deliver rapid acceleration and a smooth, refined feel. The close gear spacing ensures that the engine remains in its optimal torque range, providing instant throttle response and maximum power delivery. The 8L90E transmission is engineered to efficiently transfer engine power to the wheels, optimizing vehicle performance.

Durability and Strength

When properly maintained and upgraded, the 8L90E transmission is extremely durable. Gearstar enhances durability with upgraded clutch packs, improved torque converters, and precision control-calibrated valve bodies, which ensures that it can handle high horsepower and torque loads for years to come.

Efficiency and Fuel Savings

Thanks to its eight-speed design and lock-up torque converter, the 8L90 offers improved fuel economy compared to older six-speed transmissions. The lower first gear ratio enhances off-the-line performance, while the tall overdrive gears keep highway RPM low for better efficiency.

Broad Vehicle Compatibility

The 8L90 transmission is used across a range of GM vehicles, from high-performance sports cars to full-size trucks and SUVs. There are two versions of the 8L90 transmission: a slip yoke design for LT1 engines and a fixed yoke design for LT4 engines, each tailored for specific applications and installation requirements. These versions enhance the transmission's versatility and compatibility with different engine setups. Its versatility also makes it a popular choice for engine swaps and performance upgrades, especially in LS- and LT-powered builds.

Custom-Built Reliability

Every 8L90E transmission from Gearstar is custom-built to order by a single master technician. This ensures consistent quality and performance that mass-produced remanufactured units simply can’t match. Each unit is also DYNO-tested to guarantee reliability and precision operation before shipping.

Frequently Asked Questions About the 8L90 Transmission

Is the 8L90 a good transmission?

Yes, the 8L90 transmission is widely regarded as one of GM’s best modern automatic transmissions. It offers a strong balance of performance, durability, and efficiency. With proper maintenance and tuning, it delivers smooth shifting and exceptional power handling, even under high-performance conditions.

Which vehicles have the 8L90 transmission?

The 8L90E transmission can be found in many GM vehicles, including the Chevrolet Corvette (C7), Camaro SS and ZL1, Cadillac CTS-V, Escalade, Silverado, and GMC Sierra Denali. It’s also used in some performance-oriented SUVs and luxury sedans across GM’s lineup.

How much HP can an 8L90 handle?

From the factory, the 8L90 transmission can handle around 650–700 horsepower, depending on tuning and vehicle setup. With performance upgrades from Gearstar, such as reinforced clutches, hardened shafts, and improved torque converters, the turbine damper converter size becomes a crucial factor in supporting higher horsepower and torque levels in upgraded 8L90 transmissions. It can reliably handle even higher horsepower levels for racing or heavy-duty applications.

What’s the difference between the 8L90 and 8L90E?

The terms 8L90 and 8L90E are often used interchangeably. Technically, the “E” designates the electronic version with computer-controlled shifting, which is standard in modern GM vehicles. Functionally, they refer to the same transmission design, and the 8L90E is simply the electronically controlled version of the 8L90 platform.

Buy a Custom-Built 8L90E Transmission from Gearstar

If you’re looking for unmatched performance, durability, and precision, Gearstar’s 8L90E transmission builds are the solution. Each unit is assembled by one master technician, using only the highest-quality components and performance upgrades. Every transmission is DYNO-tested to ensure it meets Gearstar’s exacting standards before it leaves our facility.

Whether you’re upgrading your current GM vehicle or planning a custom swap, a Gearstar 8L90 transmission delivers the power, reliability, and performance you need. Contact us today to discuss your build or browse our selection of custom-built 8L90E transmissions for sale.