How to check and refill differential fluid on a 1967 Shelby GT500?

If you own a 1967 Shelby GT500, you likely value its high performance and classic charm. However, like all vehicles, it requires routine maintenance to ensure it runs smoothly. One critical aspect of this maintenance is checking and refilling the differential fluid. Ignoring this can lead to poor performance and even damage to the differential over time. Here is a step-by-step guide on how to solve this issue.

Step 1: Gather Necessary Tools and Supplies
To check and refill the differential fluid, you will need:

• Jack and jack stands
• A wrench set
• Drain pan
• Differential fluid (refer to your owner's manual for the recommended type and capacity)
• Fluid pump (optional for easier refilling)
• Clean rags or paper towels

Step 2: Locate the Differential
The differential on the 1967 Shelby GT500 is located at the rear axle, underneath the vehicle. Safely jack up the rear of the car and place it on jack stands to give you access to the differential cover, which is typically a round or oval metal cover bolted onto the rear axle housing.

Step 3: Check the Fluid Level

1. Identify the fill plug on the differential cover. It is usually a small square or hexagonal bolt located about halfway up the differential cover.
2. Use an appropriate wrench or socket to remove the fill plug. Be prepared for a small amount of fluid to drip out if the differential is properly filled.
3. Insert a clean finger into the fill hole. If you can touch the fluid with your fingertip just inside the hole, the level is adequate.

Step 4: Drain the Old Fluid (Optional but Recommended)

1. Place the drain pan underneath the differential cover.
2. If you decide to change the fluid, locate the drain plug at the bottom of the differential housing. If there is no dedicated drain plug, you will need to carefully remove the lower bolts of the differential cover to allow the fluid to drain out.
3. Once the fluid has drained completely, replace the drain plug or reattach the lower bolts of the differential cover.

Step 5: Refill the Differential Fluid

1. Insert a fluid pump’s hose into the fill hole, or if you do not have a pump, use a fluid squeeze bottle designed for this purpose.
2. Slowly pump or squeeze the new differential fluid into the fill hole until the fluid begins to seep out of the hole. This indicates that the differential is full.
3. Clean up any overflow with rags or paper towels to ensure no debris enters the differential.
4. Replace the fill plug and tighten it securely with your wrench.

Step 6: Lower the Vehicle and Dispose of Old Fluid

1. Carefully remove the jack stands and lower the vehicle back to the ground.
2. Dispose of the old differential fluid properly by taking it to a designated recycling center or auto shop that accepts used oil.

By following these steps, you can efficiently maintain your 1967 Shelby GT500's differential, ensuring its longevity and smooth operation. Always refer to your owner's manual for specific details and recommendations tailored to your classic car.