🔧 F-150 - Automatic Transmission Fluid Change

This repair replaces the automatic transmission fluid in your F-150 to help maintain smooth shifting and protect the transmission. On this model, the 10-speed automatic transmission uses a pan-mounted filter, so the correct service is a transmission pan/filter replacement with a refill and level check at the correct fluid temperature.

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

---

⚠️ Safety & Precautions

• ⚠️ Transmission fluid gets very hot. Let the truck cool before draining, then use gloves and safety glasses.
• ⚠️ Your F-150 must be lifted level for the fluid level check. A tilted truck can cause an incorrect fill.
• ⚠️ Never work under a truck supported only by a jack. Use properly rated jack stands.
• ⚠️ The engine must run during the final fluid level check. Keep hands, clothing, and tools away from moving parts and hot exhaust.
• ⚠️ Do not use universal ATF. This transmission requires the correct Ford-spec fluid.

---

🔧 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 12-quart minimum
• 8mm socket
• 10mm socket
• 13mm socket
• Ratchet 3/8-inch drive
• Torque wrench 3/8-inch drive
• Long extension 3/8-inch drive
• Trim clip remover
• Fluid transfer pump (specialty)
• Scan tool with transmission temperature data (specialty)
• Infrared thermometer
• Plastic scraper
• Brake cleaner aerosol
• Clean shop towels

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid meeting Ford MERCON ULV specification - Qty: 7-10 quarts
• Automatic transmission fluid pan with integrated filter - Qty: 1
• Transmission pan gasket - Qty: 1
• Transmission pan bolts - Qty: 1 set if supplied or damaged
• Transmission fill plug seal - Qty: 1

---

📋 Before You Begin

• Park your F-150 on level ground and let the transmission cool until it is safe to touch.
• Set the parking brake and place wheel chocks behind the rear wheels.
• A scan tool is needed to read transmission fluid temperature. A scan tool is an electronic tool that reads live vehicle data from the diagnostic port.
• The final fluid level must be checked with the engine running and the transmission fluid temperature in the specified range: 96-101°F.
• This transmission does not use a traditional engine-bay dipstick. Fluid is added and checked from underneath the truck.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and Support the Truck

• Use the floor jack rated 3-ton minimum to raise your F-150 at approved frame lift points.
• Place the jack stands rated 3-ton minimum under the frame so the truck sits level front-to-rear and side-to-side.
• Use wheel chocks to keep the truck from rolling.
• Gently shake the truck by hand to make sure it is stable before going underneath.

Step 2: Remove the Front Underbody Shield if Equipped

• Use the 8mm socket, 10mm socket, and trim clip remover to remove the underbody shield fasteners.
• Set the shield and fasteners aside in order.
• Tip: Take a photo first.

Step 3: Locate the Transmission Pan and Fill Plug

• Put on safety glasses and nitrile gloves.
• Use a clean shop towel to wipe dirt from around the transmission pan and fill plug area.
• The transmission pan is the large pan at the bottom of the transmission. The fill/check plug is on the transmission case area and is accessed from underneath.

Step 4: Loosen the Fill Plug First

• Use the correct socket from your 3/8-inch ratchet set to carefully loosen the fill plug before draining fluid.
• This is important because you must know the fill plug can be opened before removing the pan.
• If the fill plug will not loosen, stop and do not drain the transmission.

Step 5: Drain the Transmission Fluid

• Place the drain pan 12-quart minimum under the transmission pan.
• Use the 10mm socket, 13mm socket, ratchet 3/8-inch drive, and long extension 3/8-inch drive to loosen the transmission pan bolts gradually.
• Start at one corner and loosen the bolts slowly so the pan tilts and drains into the drain pan.
• Keep your face and arms away from the fluid path.
• Once most fluid has drained, remove the remaining pan bolts and lower the pan carefully.

Step 6: Remove the Old Pan and Filter Assembly

• Use the 10mm socket or 13mm socket as needed to remove any remaining pan fasteners.
• Lower the old pan/filter assembly straight down to avoid spilling fluid.
• Inspect the old fluid. Dark fluid is common. Heavy metal chunks or burnt smell may indicate internal transmission wear.

Step 7: Clean the Mating Surface

• Use the plastic scraper to gently clean the transmission case sealing surface.
• Use brake cleaner aerosol on a clean shop towel to wipe the surface clean.
• Do not gouge the aluminum surface. Scratches can cause leaks.
• Tip: Plastic scraper only.

Step 8: Install the New Pan and Gasket

• Place the transmission pan gasket onto the new automatic transmission fluid pan with integrated filter.
• Raise the new pan into position by hand.
• Start all bolts by hand first to prevent cross-threading.
• Use the 10mm socket, 13mm socket, and ratchet 3/8-inch drive to snug the bolts in a crisscross pattern.
• Use the torque wrench 3/8-inch drive to tighten the pan bolts evenly. Torque to 12 Nm (106 in-lbs).

Step 9: Add Initial Transmission Fluid

• Use the fluid transfer pump to pump MERCON ULV automatic transmission fluid into the fill opening.
• Add fluid slowly until it begins to trickle from the fill/check opening.
• Install the fill plug finger-tight for now using the matching socket and ratchet 3/8-inch drive.

Step 10: Warm the Transmission and Circulate Fluid

• Connect the scan tool with transmission temperature data to the diagnostic port under the dashboard.
• Start the engine while the truck remains safely supported and level.
• With your foot firmly on the brake, move the shifter slowly through each gear position, pausing 3 seconds in each position.
• Return the shifter to Park and leave the engine running.
• Watch transmission fluid temperature on the scan tool until it reaches 96-101°F.

Step 11: Set the Final Fluid Level

• With the engine running, use the appropriate socket and ratchet 3/8-inch drive to remove the fill/check plug.
• If no fluid comes out, use the fluid transfer pump to add MERCON ULV automatic transmission fluid until a thin stream begins to flow from the fill/check opening.
• If a heavy stream comes out, let it drain until it becomes a thin drip.
• The correct level is reached when fluid drips lightly from the opening at 96-101°F.
• Use the infrared thermometer only as a backup temperature check at the pan. The scan tool reading is the preferred method.

Step 12: Tighten the Fill Plug

• Install the new transmission fill plug seal if equipped.
• Use the correct socket and torque wrench 3/8-inch drive to tighten the fill plug. Torque to 35 Nm (26 ft-lbs).
• Wipe the area clean with a clean shop towel.

Step 13: Reinstall the Underbody Shield

• Use the 8mm socket, 10mm socket, and trim clip remover to reinstall the shield and clips.
• Make sure the shield sits flat and does not touch the exhaust or driveshaft.

Step 14: Lower the Truck

• Use the floor jack rated 3-ton minimum to raise the truck slightly off the jack stands.
• Remove the jack stands rated 3-ton minimum.
• Lower your F-150 slowly and remove the wheel chocks.

---

✅ After Repair

• Start the engine and check under your F-150 for leaks around the transmission pan and fill plug.
• Road test gently for 10-15 minutes. Confirm smooth shifts and no warning lights.
• Recheck for leaks after the road test.
• Dispose of old transmission fluid properly at a recycling center or auto parts store. Do not pour it on the ground or into drains.
• If shifting feels harsh, delayed, or a transmission warning appears, stop driving and scan for transmission codes.

---

💰 DIY vs Shop Cost

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

DIY Cost: $120-$260 (parts only)

You Save: $230-$390 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.