For Automatic Transmissions:
1. Find the dipstick: The transmission dipstick is usually located near the engine, often with a marking indicating "Transmission Fluid." It may be different from the engine oil dipstick. It may be hard to find in an older vehicle. Refer to the owner's manual to pinpoint its location.
2. Check the fluid level (when engine is running): With the engine running and warmed up (ideally at operating temperature), remove the dipstick, wipe it clean, reinsert it fully, and remove it again to check the level. The dipstick will have markings indicating "Add," "Full," and possibly "Low."
3. Add fluid (if needed): If the level is low, carefully add the correct type of transmission fluid. Your owner's manual will specify the correct type. Do not overfill. Add a small amount at a time, checking the level frequently. Adding too much fluid can be just as damaging as adding too little.
4. Re-check the level: After adding fluid, run the engine for a few minutes, then re-check the fluid level while the engine is still running.
For Manual Transmissions:
Manual transmissions generally don't have a dipstick. They're typically filled through a fill plug, usually located on the side or top of the transmission case.
1. Locate the fill plug: Consult your owner's manual for the exact location.
2. Locate the drain plug: This will usually be near the fill plug and is important to determine the correct amount to add.
3. Check the fluid level (usually you must drain and refill): There is no simple method to check the fluid level in a manual transmission. Therefore you need to drain some fluid to determine if the transmission is low. The correct amount to add is the amount that drains out.
4. Add fluid (if needed): Use a funnel to carefully add the correct type of gear oil through the fill plug. Your owner's manual specifies the correct type and amount.
5. Replace the fill plug: Ensure the fill plug is securely tightened.
Important Considerations:
* Type of fluid: Using the wrong type of transmission fluid can severely damage your transmission. Always use the type specified in your owner's manual.
* Overfilling: Overfilling is just as bad as underfilling. It can cause damage to seals and other components.
* Leaks: If you're constantly adding transmission fluid, there's likely a leak. Have a mechanic inspect the transmission for leaks.
* Professional help: If you're unsure about any part of this process, it's best to take your vehicle to a qualified mechanic. Improperly adding transmission fluid can cause significant and expensive damage.
Remember, the 1985 Ford F-150 is an older vehicle, so accessing components might be more challenging than in newer models. The owner's manual is crucial for accurate information and diagrams. If you don't have the manual, you can often find a digital copy online.
