Automatic Transmission (Most Likely AOD):
* Location: The fill plug on the AOD automatic transmission is located on the passenger side of the transmission case. It's typically a square-head plug that requires a 3/8" drive ratchet. It's often positioned higher up on the case near where the tailshaft bolts to the main transmission housing.
* Drain Plug: The drain plug on the AOD automatic transmission is typically located on the bottom of the transmission pan. It's a bolt (often 1/2") that needs to be removed to drain the fluid.
Manual Transmission (T-5):
* Fill Plug: The fill plug on the T-5 manual transmission is located on the passenger side of the transmission case, usually about halfway up. It's usually a hex-head plug, often requiring a 17mm or 18mm wrench or socket.
* Drain Plug: The drain plug on the T-5 manual transmission is located on the driver's side of the transmission case, usually near the bottom. It's also typically a hex-head plug, and will likely be the same size as the fill plug.
Key things to consider for your 1986 Mustang:
1. Identify your transmission: Look at your gear shifter. If you have Park, Reverse, Neutral, Drive, and maybe a lower gear position (like 1 or 2), then you have an automatic (likely an AOD). If you have 5 forward gears (and reverse), then you have a manual (T-5).
2. Safety: Always use the correct size tools and be careful when working under your car. Ensure the vehicle is properly supported on jack stands. Wear eye protection, and gloves to avoid the grease.
3. Tightening: When replacing the plugs, do not over-tighten. Use the proper torque spec, typically 15-25 ft lbs on the plugs. They are threaded into aluminum housings and can be easily stripped.
4. Fluid Type: Be sure to use the correct transmission fluid for your vehicle. ATF for AOD, gear oil for T-5.
5. Access: Depending on your vehicle's setup, you may need to remove a crossmember or other components to easily access the plugs.
Recommendations
* Consult a Repair Manual: A repair manual specific to your 1986 Mustang will have diagrams and precise locations of the plugs.
* Look Online: There are many online forums and websites dedicated to Mustangs that may have photos or videos showing the plug locations.
* Use a Flashlight: A flashlight will be your best friend to see around the exhaust, heat shields and other components blocking access.
* Take Pictures: Take pictures before you start and during the process to help you remember the correct position of parts.
If you're unsure, it's always best to consult with a qualified mechanic. They can ensure you are using the correct fluids and avoid any problems by stripping or over tightening the plugs.
In summary, once you determine if your 86 Mustang is an Automatic or Manual, you will know which information above is correct. If you can specify which transmission your car has I can give you an exact description.
