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 ...

We first heard rumors that General Motors was developing an all-new eight-speed automatic transmission in-house years ago, and at the North American International Auto Show in January, we learned that ...

The problem: Affected vehicles may exhibit inaccurate speedometer readings and when diagnosed, exhibit trouble codes P0717, P0721, P0722. This may be due to faulty input and output speed sensors, ...

For years, automakers were reliant on 6-speed transmissions. However, they began to adopt 8-speed replacements, following pressure from the government to meet new environmental regulations. When the 8 ...

Originally developed for the 2015 Corvette Z06, GM’s Hydra-Matic 8L90 eight-speed auto trickled to the normal 2015 Corvette and the 2015 Cadillac Escalade. Designed to be mated exclusively to the 6.2 ...