How to check and refill transmission fluid on a 1968 Ford Mustang GT Fastback (Bullitt)?

Content verified by Michael G.
July 18, 2025
Discover the easy steps to check and refill transmission fluid in your classic 1968 Ford Mustang GT Fastback (Bullitt). Keep your car running smoothly with our informative guide.

Dealing with transmission fluid issues in your 1968 Ford Mustang GT Fastback (Bullitt) can often be challenging, particularly if you're unfamiliar with older vehicles. Symptoms that may indicate low or degraded transmission fluid include difficulty shifting gears, slipping gears, or unusual noises coming from the transmission. Proper maintenance is essential to keep your classic car running smoothly, and checking and refilling the transmission fluid is part of that. Here is how to solve this issue:

Step 1: Gather the Necessary Tools
Before you begin, make sure you have the following tools and supplies:

  • A jack and jack stands
  • A set of wrenches
  • A clean funnel
  • Transmission fluid compatible with a 1968 Ford Mustang (check your owner’s manual for specifications)

Step 2: Prepare the Car
Park your Mustang on a level surface. Shift the gear lever to 'Park' and set the parking brake. Raise the car using a jack and secure it with jack stands for safety.

Step 3: Locate the Transmission Fluid Dipstick
Open the hood and locate the transmission fluid dipstick. It's typically found at the rear of the engine, near the firewall. The dipstick handle is usually labeled and often has a brightly colored plastic top, often red or yellow.

Step 4: Check the Fluid Level
Pull out the dipstick and wipe it clean with a rag. Reinsert the dipstick fully, then pull it out again to check the fluid level. The fluid should be within the "full" marks indicated on the dipstick. If it’s low or not showing at all, you’ll need to add more fluid.

Step 5: Adding Transmission Fluid
Insert a funnel into the dipstick tube. Slowly pour the recommended transmission fluid into the funnel. Add a small amount at a time, then check the level again with the dipstick to avoid overfilling. It’s essential not to exceed the “full” mark.

Step 6: Check for Leaks
After refilling, replace the dipstick and close the hood. Start the engine and let it run for a few minutes. Shift through each gear, then return to 'Park'. Check for any leaks under the car, particularly around the transmission fluid pan.

Step 7: Lower the Car
Once you confirm everything is in order and there are no leaks, lower the car off the jack stands. Ensure all your tools are gathered and your workspace is clean.

By following these steps, you can effectively check and refill the transmission fluid in your 1968 Ford Mustang GT Fastback (Bullitt). Regular maintenance is key to preserving the performance and longevity of your classic vehicle.

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