GM 8L90, 8L45 Remanufactured Valve Bodies
GM 8L90, 8L45 Remanufactured Valve Bodies
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New Business Hours: 8 am-5 pm PST Monday-Thursday
The 8L90 & 8L45 Valve Bodies Remanufactured with:
The 8L90 & 8L45 Valve Bodies Remanufactured with:
ProProven™ components
The rebuilt valve body’s commonly worn hydraulic circuits that we address:
The rebuilt valve body’s commonly worn hydraulic circuits that we address:
Main line pressure
Actuator feed limit pressure
Torque converter apply and release
Clutch control pressure
Accumulator signal pressure
Other circuits based on wear
The GM 8L90 and 8L45 transmissions feature a sophisticated hydraulic system that can experience wear over time in the valve body, leading to performance issues. Key areas of concern include main line pressure, which affects overall system efficiency, and actuator feed limit pressure, which is critical for precise actuator operation. Wear in torque converter apply and release pressures can cause TCC engagement slip or shudder, while issues with clutch control pressure may result in slipping or harsh shifts. Degradation in accumulator signal pressure often leads to inconsistent shift quality.
8L90/8L45, 2014-18, Part No. 20-160
8L90/8L45, 2019-Up, Part No. 20-160-19
8L90/8L45, 2016-18, Part No. 20-160SS (Stop/Start)
8L90/8L45, 2019-Up, Part No. 20-160-19SS (Stop/Start)
Note: R&R only.
Shipping Instructions:
Do not send the Pump, Manual Valve, Internal Wiring Harness, or, when equipped, the Stop/Start surge accumulator.
We can not repair broken solenoid connectors.
Our Unlimited lifetime warranty excludes the 8L90/45, which only comes with a 12-month warranty.
After Valve Body R&R
After Valve Body R&R
NOTE: If the valve body was rebuilt as an R&R, it does NOT require TCM or PUN programming.
When replacing a GM 8L90 or 8L45 valve body, it is essential to reprogram the Transmission Control Module (TCM) with the valve body's Part Unique Number (PUN). This step ensures proper calibration and optimal shifting performance, as the TCM depends on the PUN to accurately control solenoid flow rates within the valve body. Skipping this process can lead to shifting issues and compromised transmission performance.
General reference:
General reference:
Valve body to case torque 97-inch lbs.
GM 8L90 Transmission Overview
GM 8L90 Transmission Overview
The GM 8L90 and 8L45 are high-performance, 8-speed automatic transmissions introduced by General Motors in 2014. As the most robust member of GM’s 8LXX family, it is designed for rear-wheel-drive (RWD) applications in luxury and performance vehicles. Key features include:
Wide Ratio Spread: Enhances acceleration and fuel efficiency
Advanced Technology: Adaptive shift controls and durable construction for seamless performance
Applications: Used in high-performance vehicles like the Chevrolet Camaro ZL1, Cadillac CT6, and Escalade-V
Benefits: Faster shifts, improved efficiency, and enhanced driving dynamics
The 8L90 is a cornerstone of GM's efforts to combine power, efficiency, and reliability in modern vehicles
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