Causes of impacts when engaging reverse gear of an automatic transmission:
1. Wear of friction discs:
*Over time, the friction discs in the transmission wear out, reducing their thickness and efficiency.
* This may cause clutch slippage and shock when engaging reverse gear.
2. Damaged or worn overrunning clutch:
* An overrunning clutch is a device in an automatic transmission that allows the wheel shafts to rotate at different speeds.
* Damage or wear to the overrunning clutch may cause torque to be transmitted to the transmission even when the brake pedal is depressed, causing shock when engaging reverse gear.
3. Low transmission fluid level:
* Insufficient transmission fluid levels can lead to poor lubrication and cooling of the internal components of the automatic transmission.
* This may increase friction and cause shock when shifting gears.
4. Transmission fluid filter clogged:
* A dirty transmission fluid filter can restrict fluid flow and cause insufficient pressure.
* This may cause clutch slippage and shock when shifting gears.
5. Faulty gear selector position sensor:
* A faulty shift position sensor may send incorrect signals to the transmission ECU.
* This may result in improper activation of the pressure control valves and shock when shifting gears.
6. Electrical problems:
* Poor connections or breaks in electrical connectors or wires can impair the operation of the transmission ECU.
* This may result in improper valve control and shifting shock.
7. Torque converter wear:
* A torque converter is a device in an automatic transmission that transmits torque from the engine to the transmission.
* Worn torque converter can cause vibration and shock when shifting gears.