How to Flush a Manual Transmission

by Jeanene S. Valentine
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Performing routine maintenance on your own vehicle is essential. Not only do you learn more about how your vehicle works and the best way to care for it, but you also learn how to save money with do-it-yourself repairs. Most vehicle manufacturers suggest replacing your transmission fluid at least every 40,000 to 100,000 miles. Flushing your transmission, before replacing the fluid, will help remove engine gunk and increase your transmission's life. Manual transmissions are slightly different than automatic transmissions, but flushing each of them is simple and quick.

Step 1

Raise the vehicle using a jack and place it securely on jack stands.

Step 2

Place the transmission drain pan beneath the transmission under the vehicle.

Step 3

Remove the transmission drain plug located at the bottom of the transmission with the socket wrench. Allow the transmission fluid to fully drain into the drain pan.

Step 4

Remove the transmission fill plug that is located on the side of the transmission with the socket wrench. Insert the open end of the transmission filler hand pump into the transmission fill plug opening.

Step 5

Pour half a can of Sea Foam Trans Tune (available at local auto parts stores) into the transmission filler container and allow it to run through the transmission. Wait several minutes for the fluid to completely drain into the drain pan.

Step 6

Replace and tighten the transmission drain plug back into position on the transmission with the socket wrench. Do not overtighten.

Step 7

Use the hand pump to pour in the specified amount of new transmission fluid into the transmission. Refer to your vehicle owner's guide for specific transmission grade and amount. All vehicles are different. Replace and tighten the transmission fill plug using the socket wrench.

Step 8

Lower the vehicle then take it for a test drive. Check the transmission plugs for leaks. If leaks are apparent, use a clean shop rag to feel along the transmission to find where it is coming from. At times the drain or fill plug will leak. If the plug does leak, it will need to be further tightened or replaced.

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