When HPP teamed with GM Performance Parts (GMPP) and Classic Restorations to mate the new THM 4L85-E SuperMatic transmission to a built-to-the-hilt SD-455, we wanted to fully document the process.

Some units of the 2021 Corvette Stingray may require a Transmission Control Module reprogramming. The error in the module software could result in the active ...

CARS.COM — Vehicles affected by service bulletin: The problem: Drivers may note erratic shift patterns in the transmission due to a software glitch in the transmission control module program. See More ...

A programming error in the Transmission Control Unit (TCU) may allow the clutch to engage before the drive chain is completely clamped. View full recall details at NHTSA.gov ...