Why Does the Transmission Jerk After Changing the Transmission Fluid?
2 Answers
After changing the transmission fluid, the transmission jerks because the wrong type of fluid was used or the method of changing the fluid was incorrect. Methods for changing transmission fluid: There are two main methods for changing transmission fluid. The first method is similar to changing engine oil, known as the gravity drain method. The second method involves using a fluid exchange machine. Transmission fluid: Transmission fluid plays a crucial role in lubricating, cleaning, and cooling the transmission. However, over time, the effectiveness of the fluid diminishes. If not replaced regularly, it can cause damage to the transmission, so periodic replacement is necessary.
It's actually quite common to experience jerking after changing the transmission fluid, mainly due to several reasons. First is the issue of fluid selection. Transmission fluid has specific viscosity grades, and using the wrong type or incompatible fluid, such as one with too high or too low viscosity, can affect the smooth operation of the hydraulic system, leading to jerky gear shifts. Second is improper operation during the fluid change process, such as not completely draining the old fluid and leaving residual impurities during a gravity change, or stirring up deposits that clog the filter and pipes during a flush change. Third is inaccurate fluid level control—overfilling increases internal pressure and causes jerking, while underfilling leads to insufficient lubrication. Additionally, there may be underlying wear inside the transmission, such as aging seals or clutch plate issues, which were masked by the old fluid but exposed after the change. It's recommended to check whether the fluid meets specifications and whether the change method was correct, and if necessary, return to the repair shop for a recheck to ensure safe driving. For regular maintenance, it's best to choose the manufacturer-recommended fluid to prevent similar issues.
