🔧 F-150 - Automatic Transmission Fluid & Filter Change

This job drains the old transmission fluid, replaces the transmission pan filter, and refills the 10-speed automatic transmission with the correct fluid. Your F-150 uses a sealed-style transmission, so the final fluid level must be checked with the transmission warm and level.

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

Assumption: Your F-150 has the Ford 10-speed automatic transmission used with the 5.0L V8.

---

⚠️ Safety & Precautions

• ⚠️ Work on a flat, stable surface only. The truck must be level when checking fluid level.
• ⚠️ Transmission fluid can get very hot. Wear gloves and safety glasses.
• ⚠️ Never rely on a floor jack alone. Always support the F-150 with jack stands.
• ⚠️ Keep the engine running during the final fluid level check, with your foot on the brake and the parking brake set.
• ⚠️ Use only Ford-approved MERCON ULV automatic transmission fluid. The wrong fluid can cause shifting problems or transmission damage.
• ⚠️ A scan tool is strongly recommended because fluid level must be checked at the correct transmission fluid temperature.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack rated 3-ton minimum
• Jack stands rated 3-ton minimum
• Wheel chocks
• Safety glasses
• Nitrile gloves
• Drain pan 10-quart minimum
• 8mm socket
• 10mm socket
• 13mm socket
• Ratchet 3/8-inch drive
• Torque wrench 1/4-inch drive
• Torque wrench 3/8-inch drive
• Socket extension 6-inch
• Trim clip removal tool
• Plastic scraper
• Brake cleaner spray
• Lint-free shop towels
• Fluid transfer pump (specialty)
• OBD-II scan tool with transmission temperature data (specialty)
• Infrared thermometer (specialty)

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• MERCON ULV automatic transmission fluid - Qty: 6-8 quarts
• Automatic transmission filter - Qty: 1
• Transmission pan gasket - Qty: 1
• Transmission fill plug seal - Qty: 1
• Transmission pan bolts - Qty: 1 set if corroded or damaged

---

📋 Before You Begin

• 🅿️ Park your F-150 on level ground and set the parking brake.
• 🛞 Place wheel chocks behind the rear wheels before lifting the truck.
• 🌡️ Let the transmission cool if the truck was recently driven. Warm fluid drains better, but hot fluid can burn you.
• 🔍 Connect an OBD-II scan tool and confirm it can read transmission fluid temperature. An OBD-II scan tool plugs into the diagnostic port and lets you see live vehicle data.
• 🧰 A fluid transfer pump is a hand pump used to push new fluid into the transmission through the fill port.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and Support the F-150

• Use the floor jack rated 3-ton minimum to lift the front of the truck at the proper front crossmember lift point.
• Place jack stands rated 3-ton minimum under the frame rails.
• Lower the truck gently onto the jack stands.
• Use wheel chocks at the rear wheels.
• Shake test before crawling under.

Step 2: Remove the Lower Shield if Equipped

• Use a trim clip removal tool to remove any plastic retainers from the lower shield.
• Use an 8mm socket or 10mm socket to remove shield bolts, depending on the fastener style installed.
• Set the shield and hardware aside in order.

Step 3: Locate the Transmission Pan and Fill Plug

• Use a flashlight if needed to locate the transmission pan under the center of the truck.
• The fill/check plug is on the transmission case area, not at the top like an engine oil fill cap.
• Before draining anything, make sure you can access and loosen the fill/check plug.
• Always confirm refill access first.

Step 4: Loosen the Fill/Check Plug First

• Use the correct socket from your set, commonly a 13mm socket, with a ratchet 3/8-inch drive to carefully loosen the fill/check plug.
• Do not remove it fully yet unless fluid starts dripping out.
• If the plug is stuck, stop and do not drain the transmission.

Step 5: Drain the Transmission Pan

• Place a drain pan 10-quart minimum under the transmission pan.
• If your pan has a drain plug, use the correct socket, commonly a 13mm socket, to remove it and drain the fluid.
• If your pan does not have a drain plug, use a 10mm socket to slowly loosen the pan bolts around the rear and sides first.
• Leave a few bolts loosely installed at the front so the pan tilts down and drains in a controlled way.
• Once fluid slows, remove the remaining pan bolts with the 10mm socket.

Step 6: Remove the Transmission Pan

• Support the pan with one hand and use the 10mm socket to remove the last bolts.
• Lower the pan carefully because it may still contain fluid.
• Pour the remaining fluid into the drain pan.
• Inspect the pan for metal chunks. A light gray paste on the magnet is normal wear material.

Step 7: Replace the Transmission Filter

• Use the correct socket, commonly a 10mm socket, to remove the transmission filter fasteners if equipped.
• Pull the filter straight down by hand. Some fluid will spill.
• Make sure the old filter seal comes out with the old filter.
• Install the new automatic transmission filter by pressing it straight into place.
• Use the torque wrench 1/4-inch drive to tighten filter bolts if equipped to Torque to 10 Nm (89 in-lbs).

Step 8: Clean the Pan and Gasket Surface

• Use a plastic scraper to gently remove old gasket material from the pan surface.
• Use brake cleaner spray and lint-free shop towels to clean the pan and magnet.
• Do not use a metal scraper on aluminum sealing surfaces.
• Install the new transmission pan gasket onto the pan.

Step 9: Reinstall the Transmission Pan

• Raise the pan into place by hand.
• Start all pan bolts by hand first to avoid cross-threading.
• Use a 10mm socket to snug the bolts in a crisscross pattern.
• Use the torque wrench 1/4-inch drive to tighten the pan bolts evenly to Torque to 10 Nm (89 in-lbs).
• If removed, reinstall the drain plug with a new seal and use a torque wrench 3/8-inch drive to tighten to Torque to 16 Nm (12 ft-lbs).

Step 10: Add New Transmission Fluid

• Remove the fill/check plug fully using the correct socket, commonly a 13mm socket.
• Install the hose from the fluid transfer pump into the fill/check opening.
• Pump in MERCON ULV automatic transmission fluid until fluid begins to lightly run back out of the fill/check opening.
• Temporarily install the fill/check plug by hand.

Step 11: Warm the Transmission and Cycle the Gears

• Start the engine while the truck remains level and safely supported.
• Keep your foot firmly on the brake pedal.
• Move the shifter slowly through each gear position, pausing 3 seconds in each position.
• Return the shifter to Park.
• Use the OBD-II scan tool with transmission temperature data to monitor transmission fluid temperature.

Step 12: Set the Final Fluid Level

• With the engine running, transmission in Park, parking brake set, and the truck level, monitor fluid temperature with the OBD-II scan tool with transmission temperature data.
• When transmission fluid temperature is approximately 85-93°C (185-200°F), remove the fill/check plug using the correct socket, commonly a 13mm socket.
• If no fluid drips out, use the fluid transfer pump to add MERCON ULV automatic transmission fluid until a thin stream runs out.
• If a heavy stream runs out, let it drain until it becomes a thin drip.
• Install the fill/check plug with a new transmission fill plug seal.
• Use the torque wrench 3/8-inch drive to tighten the fill/check plug to Torque to 35 Nm (26 ft-lbs).

Step 13: Reinstall the Lower Shield

• Use the 8mm socket or 10mm socket to reinstall the lower shield bolts.
• Use the trim clip removal tool by hand to align and reinstall any plastic retainers.
• Snug the small shield bolts only. Do not overtighten plastic shield hardware.

Step 14: Lower the Truck

• Use the floor jack rated 3-ton minimum to lift the truck slightly off the jack stands.
• Remove the jack stands rated 3-ton minimum.
• Lower the F-150 slowly to the ground.
• Remove the wheel chocks.

---

✅ After Repair

• ✅ Test drive gently for 10-15 minutes. The shifts should feel smooth and normal.
• ✅ Park on level ground and check under the truck for leaks around the pan and fill/check plug.
• ✅ Recheck for leaks again after the next drive.
• ✅ Dispose of old transmission fluid properly at an approved recycling center or auto parts store that accepts used fluid.
• ✅ If shifting feels harsh, delayed, or abnormal, stop driving and recheck fluid level at the correct temperature.

---

💰 DIY vs Shop Cost

Shop Cost: $350-$650 (parts + labor)

DIY Cost: $120-$250 (parts only)

You Save: $230-$400 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

---

🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.