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Ford Mustang GT 1996-2004: How to Change Manual Transmission Fluid

The manual transmission fluid cools, cleans, and lubricates the components inside the transmission. The fluid must remain clean and at the proper level for correct transmission operation. Checking the fluid at regular intervals (around 60,000 miles) will ensure your transmission is getting the lubrication it needs.

By Weston Chadwick - October 27, 2015
Contributors: cliffyk

This article applies to the Ford Mustang GT (1996-2004).

The T45 and TR-3650 use a synthetic automatic transmission fluid developed by Ford. This fluid is pumped throughout the transmission once the engine is started by the oil pump. The fluid creates a film around components, which reduces friction and promotes smooth operation. The tolerances inside the transmission between components are very small, making even small mounts of dirt wear inducing.

Materials Needed

  • Floor Jack
  • Jack stands (x4)
  • 3/8" ratchet
  • Fluid transfer pump
  • Drain pan
  • Rubber gloves
  • Safety glasses
  • 3.2 quarts of Mercon automatic transmission fluid

Step 1 – Raise and support the vehicle

The vehicle needs to be leveled 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. Jacking points.

Step 2 – Drain the fluid

Locate the fill and drain plugs on the passenger's side of the transmission. Place a drain pan beneath the plugs. Using a 3/8 ratchet (and a small 3/8" extension if you'd like), remove the fill plug and then the drain plug. Once the fluid flow slows to a drip, re-install the drain plug.

Figure 2. The fill and drain plug locations.

Step 3 – Fill the transmission

The transmissions fluid capacity is 3.0 liters or 3.2 quarts. Mercon automatic transmission fluid is recommended by Ford; although, owners also use Royal Purple Synchromax. Pump the fluid through the fill plug with a fluid transfer pump until the level is 3/4" below the fill line. You can use your finger (with a rubber glove) to check the level. Re-install the fill plug and tighten the plug until it becomes snug.

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