🔧 Transmission Fluid - Drain & Refill

Your F-150 uses a sealed 6-speed automatic transmission with no dipstick. A proper fluid service means draining the pan, replacing the filter if you are doing a full service, then refilling and checking the level at the correct fluid temperature.

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

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⚠️ Safety & Precautions

• Work on level ground and keep the parking brake set.
• Use jack stands. Never rely on a jack alone.
• Transmission fluid can be hot. Let the truck cool before draining.
• The level must be checked at the correct transmission temperature using a scan tool or temperature display.
• Do not overfill. Overfilled transmission fluid can cause shifting problems and leaks.
• No battery disconnect is required for this service.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated for truck weight)
• Wheel chocks
• Drain pan
• Ratchet
• 8mm socket
• 10mm socket
• Torx T40 socket
• Torque wrench
• Fluid transfer pump
• Scan tool or OBD-II scan app with transmission temperature data
• Trim clip tool
• Safety glasses
• Nitrile gloves
• Shop towels
• Funnel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid (MERCON LV) - Qty: 8 quarts for drain and refill; up to 13 quarts for full service
• Transmission filter - Qty: 1
• Transmission pan gasket - Qty: 1
• Transmission pan drain plug seal - Qty: 1

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📋 Before You Begin

• Park on a level surface.
• Set the parking brake and chock the rear wheels.
• Raise the truck safely and support it on jack stands if you need more room under the transmission pan.
• Have the new fluid ready before you start. You must fill the transmission before checking level.
• If your truck has a skid plate, remove it first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the skid plate and access shields

• Use the 8mm socket or 10mm socket to remove the skid plate or lower splash shield, if equipped.
• Set the hardware aside in order.

Step 2: Drain the transmission fluid

• Place the drain pan under the transmission pan.
• Use the Torx T40 socket to remove the drain plug, if equipped.
• Let the fluid drain completely.
• Expect dark fluid on higher-mileage trucks.

Step 3: Remove the transmission pan

• Use the 10mm socket to loosen the pan bolts evenly.
• Leave a few bolts threaded in one side, then lower the pan carefully.
• Drain the remaining fluid into the drain pan.

Step 4: Replace the filter

• Use your hand or a trim clip tool to remove the old transmission filter.
• Install the new filter until it seats fully.
• Make sure the old filter seal comes out with the filter.

Step 5: Clean and reinstall the pan

• Clean the pan and magnets with shop towels and fresh fluid.
• Install the new transmission pan gasket.
• Reinstall the pan and hand-start all bolts.
• Use the torque wrench and 10mm socket to tighten the pan bolts evenly.
• Torque to 12 Nm (106 in-lbs).

Step 6: Refill with MERCON LV fluid

• Remove the transmission fill plug.
• Use the fluid transfer pump and funnel to add MERCON LV fluid.
• Add fluid slowly until it begins to reach the proper level-check point.

Step 7: Start the engine and circulate fluid

• Start the engine with the parking brake set.
• Use the scan tool or OBD-II scan app with transmission temperature data to monitor transmission fluid temperature.
• With your foot on the brake, move the shifter through each gear position, pausing a few seconds in each.
• Return the shifter to Park.

Step 8: Set the final fluid level

• With the engine idling and the transmission at the correct fluid temperature, remove the level/check plug.
• Add fluid through the fill opening with the fluid transfer pump until a small steady drip comes from the level port.
• Install the check plug and fill plug.
• Torque to 35 Nm (26 ft-lbs) for the plug, unless your plug marking states otherwise.
• Use only the specified fluid.

Step 9: Reinstall shields and lower the truck

• Reinstall the skid plate or splash shield with the 8mm socket or 10mm socket.
• Lower the truck off the jack stands.

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✅ After Repair

• Test drive the truck for 10-15 minutes.
• Check for leaks at the pan, drain plug, and fill plug.
• Recheck the fluid level if shifting feels abnormal or if you had to add a large amount.
• Reset your service reminder if you use one.

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $90-$180 (parts only)

You Save: $160-$270 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-3 hours.

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🎯 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.