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Ford Mustang V6 and GT 2005-2014: How to Replace Manual Transmission Fluid on 5-Speed

Manual transmission fluid is constantly circulated inside, as the main shaft and counter shaft gears spin. This creates a film on metal surfaces that reduces heat and wear. Fluid that is contaminated with dirt and metal shavings creates friction, leading to harsh shifting engagement.

By Weston Chadwick - October 26, 2015
Contributors: moosestang

This article applies to the Ford Mustang V6 and GT (2005-2014).

A low fluid level or contaminated fluid can quickly wear out numerous components inside your transmission. The surface of shift forks, rails as well as synchronizers are smooth and depend on the fluids viscosity to generate smooth/quick shifts. Although the recommended fluid change interval is large (100,000 miles), shortening that amount can be wise. This is especially true if you have a more aggressive driving style with frequent gear changes and higher transmission temperatures that accompany it.

Materials Needed

  • 3/8" ratchet
  • Small 3/8" extension
  • Fluid transfer pump
  • Drain pan
  • Floor jack
  • Jack stands (x4)
  • 4 quarts of manual transmission fluid
  • Torque wrench

You will need a fluid transfer pump to fill the transmission, which can be bought from Amazon.

Step 1 – Raise and support the vehicle

The vehicle needs to be level or on a level surface for an accurate reading. Engage the emergency brake. Position the floor jack below one of the jacking points on the front of the vehicle. Once your desired height is achieved, place a jack stand as close to the jacking point as possible. Repeat this procedure for the other corners. Blocks of wood can be placed between the jack stands and body to reduce the chance of damage.

Figure 1. Mustang jacking points.

Step 2 – Drain the transmission

Locate the fill and drain plugs. The fill plug is located near the plastic tube in Figure 2. You will need a 3/8" extension and a ratchet to remove it. Always remove the fill plug first to ensure that you have the means of removing it. Nothing is worse than draining all of the transmission fluid, only to find that you don't have the right tool to remove the fill plug. Place a drain pan beneath the drain plug and remove it with the same extension; it's located on the bottom side of the transmission (see Figure 3).

  • Figure 2. The fill plug is near the plastic hose.
  • Figure 3. The drain plug.

Step 3 – Fill the transmission

Re-install the drain plug. Insert your fluid transfer pumps outlet hose into the fill hole. Pump 3.2 quarts of fluid into the transmission. The fluid should be about half an inch below the fill plug opening. You can use a paper clip to verify the fluid level. Torque the fill and drain plugs to 18 ft. lbs.

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