What is the difference in a transmission flush and a service?
The transmission flush has become very popular with shops. It is highly profitable, does not require much skill and there are no filters to stock. In effect, clean fluid is circulated through the transmission. I feel this does little good and can cause harm. Worse, a generic fluid may be used, rather than the specific fluid recommended by the manufacturer. Another problem is, the filter is not addressed. If it were dirty or restricted before the flush it will be at least as dirty after. Flushing may also dislodge debris in the pan and further restrict the filter. With proper service, the vehicle is test driven and any symptoms noted. Next the pan is removed, if so equipped and the filter replaced. This step gives a trained technician the opportunity to check for problems. It also allows for a band adjustment, re-torque of valve body bolts or other things that can prevent problem. Finally the transmission is filled with the vehicle manufacturer recommended fluid. For much more on proper
