What is the M gear function of the Buick GL8?

[MacAlaina]

M gear is the manual shifting mode of an automatic transmission. How to use M gear: When the vehicle's gear lever is in M gear, there are '+' and '-' signs next to the gear lever. After shifting into M gear, pushing towards the '-' direction will downshift, and pushing towards the '+' direction will upshift. Functions of M gear: The manual mode allows the driver to shift up or down manually. When descending long or steep slopes, the manual mode can lock the transmission in a lower gear. If relying solely on the braking system to slow down during long or steep descents, it may cause the braking system temperature to rise rapidly, leading to heat fade or loss of braking power. When climbing steep or long slopes, the manual mode can also be used to stay in a lower gear, providing greater vehicle torque and making it easier to climb.