What causes a strong jerking sensation when shifting from P to R in an automatic transmission?

[Saul]

Reasons for jerking when shifting from P to R in an automatic transmission: 1. Solenoid valve damage: Damaged solenoid valves are a major cause of jerking. A simple distinction is that occasional occurrences have no discernible pattern, while fixed occurrences happen consistently when reaching a certain speed or shifting to a specific gear (e.g., shifting from 2nd to 3rd gear), resulting in a fixed jerking sensation. 2. Transmission blockage: If sludge in the transmission's internal circulation blocks the oil passages in the valve body, it can lead to stumbling issues, causing a series of transmission problems such as overheating, impact, and slippage, resulting in jerking during gear shifts.