The Hydra-Matic 8L90 (production code M5U) is a fuel-saving and electronically controlled eight-speed automatic transmission developed and produced by General Motors for use in rear- and rear-biased ...

Long before automatic transmissions like the 4L60E earned such bad reputations, General Motors entrusted the Turbo Hydra-Matic family to handle shifting duties in its legendary lineup of muscle cars.

All Chevrolet and GMC trucks with 6.2 EcoTec3 V8 engines will come standard with an 8-speed Hydra-Matic automatic transmission to replace the current 6-speed for 2015. I imagine the 2015 Cadillac ...

Basically, we’re talking witchcraft. When it comes to the modern automobile, even the casual observer can relate how most systems work: gas goes boom – the engine turns; brakes clamp down – the car ...