🔧 Transmission Fluid Change - Service

This service replaces the automatic transmission fluid and checks the level the correct way. Your F-150 uses a sealed-style fill/check setup, so the fluid level must be verified at the correct fluid temperature and with the engine running.

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

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⚠️ Safety & Precautions

• Work on a level surface and support the truck securely with jack stands before going underneath.
• Transmission fluid can be hot. Let the truck cool before draining, then be careful during level checking.
• Keep dirt out of the transmission. A sealed system is very sensitive to contamination.
• The fluid level must be checked with the engine running and fluid at the correct temperature.
• 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
• Torque wrench
• Fluid transfer pump or hand pump (specialty)
• Scan tool with transmission temperature display (specialty)
• Safety glasses
• Nitrile gloves
• Shop towels
• Funnel with hose

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• MERCON LV automatic transmission fluid - Qty: 12 quarts
• Transmission pan gasket - Qty: 1
• Transmission filter - Qty: 1
• Transmission pan bolts - Qty: 1 set

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the truck cool enough to work safely.
• Raise and support the front of the truck securely so it stays level.
• Have your scan tool ready to read transmission fluid temperature.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and secure the truck

• Use the floor jack to lift the truck and support it with jack stands.
• Chock the rear wheels with wheel chocks.
• Make sure the truck sits level for correct fluid level checking.

Step 2: Drain the transmission fluid

• Place the drain pan under the transmission pan.
• Use the ratchet and 8mm socket to loosen the pan bolts slowly.
• Leave one side partially attached so the fluid drains in a controlled way.
• Remove the pan fully once the fluid slows to a drip.
• Expect a messy drain.

Step 3: Remove the pan and filter

• Use the ratchet and 8mm socket to remove the remaining pan bolts.
• Lower the pan carefully and pour out any remaining fluid.
• Remove the old transmission filter by pulling it straight down.
• Let the old fluid drain completely.

Step 4: Clean the pan and install the new filter

• Clean the pan thoroughly with shop towels.
• Clean the magnets in the pan if equipped.
• Install the new transmission filter by pushing it into place.
• Install the new transmission pan gasket.

Step 5: Reinstall the transmission pan

• Hold the pan in place and start all bolts by hand.
• Use the ratchet and 8mm socket to snug the bolts in a crisscross pattern.
• Torque to 10 Nm (89 ft-lbs).
• Do not overtighten. The pan can warp easily.

Step 6: Add new fluid

• Lower the truck if needed so it remains level.
• Use the fluid transfer pump or funnel with hose to add MERCON LV automatic transmission fluid through the fill port.
• Start with about 8 quarts, then add more in small amounts later during level setting.
• Add slowly and recheck often.

Step 7: Warm up and set the fluid level

• Start the engine and keep the parking brake on.
• With your foot on the brake, move the shifter through all gear positions, pausing briefly in each one.
• Use the scan tool to monitor transmission fluid temperature.
• When fluid temperature reaches the correct range, check the fill port level.
• Add fluid with the fluid transfer pump until a thin stream just begins to drip from the fill port.
• Torque the fill plug to 35 Nm (26 ft-lbs).

Step 8: Final check

• Inspect the pan, drain area, and fill plug for leaks.
• Lower the truck fully.
• Test drive gently and confirm normal shifting.

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✅ After Repair

• Recheck for leaks after the test drive.
• Verify shift quality in all gears.
• If the fluid level was low, recheck it at the proper temperature and top off as needed.
• Dispose of used transmission fluid properly at a recycling center.

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💰 DIY vs Shop Cost

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

DIY Cost: $120-$220 (parts only)

You Save: $130-$230 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.

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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.