What Causes a Clunking Sound When Shifting Gears in an Automatic Transmission?
1 Answers
Automatic transmission may produce a clunking sound when shifting gears due to issues such as generator gear problems, large cold engine valve clearance with poor lubrication, transmission failure, or shifting gears before the vehicle comes to a complete stop. Below is an introduction to the gears of an automatic transmission: 1. P (Park) Gear: This is the parking and starting gear. When engaged, the parking lock mechanism locks the transmission output shaft. 2. R (Reverse) Gear: This is the reverse gear. Engaging this gear connects the hydraulic system's reverse oil circuit, causing the drive wheels to rotate in reverse for backing up. Never force the gear into "R" when the vehicle is not completely stopped, as this may damage the transmission. 3. N (Neutral) Gear: This is the neutral gear. When engaged, the planetary gear system idles without power output. 4. D (Drive) Gear: This is the forward gear, also known as the driving gear. When the gear selector is in this position, the hydraulic control system automatically engages the appropriate forward gear based on throttle position and vehicle speed signals. It shifts up or down automatically as speed changes, enabling automatic transmission functionality. 5. S (Sport) Gear: This is the sport mode. When the gear selector is in this position, the transmission control module receives the driver's command, and the vehicle enters sport mode. The shifting logic becomes more aggressive, with more frequent gear changes, providing better control and throttle response for a more engaging driving experience.
