. GM has selected its Windsor (Canada) Transmission plant to supply transmissions for the new mild hybrid Saturn Vue due out next year and other future GM models using the Belt Alternator Starter hybrid system. (earlier post).
The Windsor Transmission plant currently builds automatic four-speed transmissions for small front-wheel-drive cars such as the Chevy Cobalt and Pontiac G6
Windsor Transmission’s contribution to the hybrid is an altered version of the four-speed automatic 4T45e transmission it has been building for many years.
The main feature of the hybrid version of the transmission is an auxiliary electric hydraulic pump which will keep the clutch engaged to prevent the SUV from rolling backwards when it's stopped on an incline. The engines of nearly all hybrids shut down at stoplights and restart as soon as the driver's foot lifts off the brake pedal.
The auxiliary pump, about the size of a medium automotive oil filter, is bolted to the side of the transmission housing, which has been altered for the hybrid version.
GM’s mild hybrid engines also require a specially strengthened serpentine belt to withstand higher torque routed through the alternator/generator.