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.

Automatic transmissions have been with us for a long, long time. In fact, the basics can be found in the Model T Ford. At the heart of an automatic transmission are the planetary gearsets. As gears go ...

The idea is easy. There are two solenoids controlled by the TCU that select which gear to use by which is off and which is on at any given time. We are going to control solenoid number 2 with a Single ...

Subaru of America, Inc. (Subaru) is recalling certain 2020-2021 Outback and Legacy vehicles. A programming error in the Transmission Control Unit (TCU) may allow the clutch to engage before the drive ...

Affected vehicles include model-year 2019-20 Ascent SUVs and model-year 2020 Legacy wagons and Outback cars. A programming error in the transmission control unit may ...

Subaru of America, Inc. (Subaru) is recalling certain 2019-2020 Ascent, 2020 Legacy and Outback vehicles. A programming error in the Transmission Control Unit (TCU) may allow the clutch to engage ...