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.

General Motors is recalling 2013-model year Cadillac SRX crossovers after a programming fault in the vehicle was discovered, the National Highway Traffic Safety Administration announced today The ...

“Any transmission updates available?” is one of the first questions I ask when taking Cars.com’s 2014 Jeep Cherokee long-term test car into the dealership for service. The nine-speed automatic ...

DIGITAL EDITOR ANDREW STOY: I often think we're living in the Malaise Era of transmission programming. What the late 1970s were to engine controls--emissions Band-Aids resulting in drivability ...