Worn-out Clutch: If your 4 Runner has a manual transmission, a worn-out clutch can cause difficulty shifting gears or slipping while driving.
Transmission Fluid: Check the transmission fluid level and condition. If the fluid is low or dirty, it can affect the transmission's performance.
Shift Linkage: Check the shift linkage for any damage or misalignment, as it can result in shifting problems.
Faulty Sensors: Some sensors, such as the neutral safety switch or speed sensor, can cause transmission-related issues if they malfunction.
Damaged Gear: Worn-out or damaged gears within the transmission can cause grinding noises, difficulty shifting, or even complete failure of the transmission.
Torque Converter: In automatic transmission models, problems with the torque converter, which transfers power from the engine to the transmission, can lead to transmission issues.
Vacuum Lines: If your 4 Runner has a vacuum-operated transmission control system, leaks or damage to vacuum lines can affect shifting performance.
To accurately identify and fix the problem, it's recommended to have a qualified mechanic inspect and diagnose the issue. Transmission problems can be complex, so professional diagnosis and repairs are often the best course of action.
