🔧 4Runner - Transmission Fluid Drain and Refill

This procedure replaces the serviceable portion of the automatic transmission fluid without using a pressurized flush machine. Your 4Runner uses a sealed A750F transmission, so the final fluid level must be checked at a specific temperature through the overflow tube.

Difficulty Level: Intermediate | Estimated Time: 1.5-2.5 hours

Assumption: This is a routine drain-and-refill with no transmission leaks or shifting problems.

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⚠️ Safety & Precautions

• ⚠️ Keep your 4Runner level while checking the fluid level. An angled vehicle will produce an incorrect reading.
• ⚠️ Support your 4Runner with four appropriately rated jack stands. Never work beneath a vehicle supported only by a floor jack.
• ⚠️ Automatic transmission fluid can cause burns. Wear gloves and safety glasses.
• ⚠️ The engine must run during the final level check. Keep hands, tools, clothing, and the pump hose away from moving and hot components.
• ⚠️ Use only Toyota Genuine ATF WS or an explicitly Toyota WS-approved fluid. Do not mix it with Dexron or universal fluid.
• ⚠️ Do not use a pressurized transmission-flush machine for this maintenance procedure.
• 🔋 Battery disconnection is not required.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack rated 3-ton minimum
• Four jack stands rated 3-ton minimum per pair
• Wheel chocks
• 12mm socket
• 14mm socket
• 24mm socket
• 5mm hex-bit socket
• 3/8-inch-drive ratchet
• 1/2-inch-drive breaker bar
• Torque wrench rated 10-80 ft-lbs
• Inch-pound torque wrench rated 10-100 in-lbs
• OBD-II scan tool with Toyota transmission-fluid temperature data (specialty)
• ATF fluid-transfer pump with fill hose (specialty)
• Drain pan with 8-quart minimum capacity
• Graduated measuring container with 5-quart capacity
• Mechanic’s creeper
• Nitrile mechanic’s gloves
• Safety glasses
• Shop towels

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Toyota Genuine ATF WS or Toyota WS-approved automatic transmission fluid - Qty: 4 quarts
• Transmission drain-plug sealing washer - Qty: 1
• Transmission fill-plug sealing washer - Qty: 1
• Transmission overflow-plug sealing gasket - Qty: 1
• Brake cleaner - Qty: 1 can

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📋 Before You Begin

• 🅿️ Park your 4Runner on firm, level pavement. Apply the parking brake and chock the wheels.
• 📏 If additional clearance is needed, raise the entire vehicle and place it on four jack stands at equal height. Verify that it is level before going underneath.
• 🌡️ Begin with the transmission cool. The final check must occur at an automatic transmission fluid temperature of approximately 40-45°C (104-113°F).
• 🔍 Connect the OBD-II scan tool before starting. A scan tool reads the transmission’s internal temperature through the diagnostic connector beneath the driver’s side dashboard.
• 🧰 A torque wrench tightens a fastener to a measured amount. Use it instead of estimating tightness by hand.
• 🚫 No infotainment setting, battery registration, or transmission coding is required.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Warm and Position the Vehicle

• Use the OBD-II scan tool to monitor the transmission-fluid temperature while taking a short 5-10 minute drive.
• Park on level ground, apply the parking brake, and use wheel chocks to secure the vehicle.
• Switch off the engine and allow hot components to cool enough to touch safely.
• If lifting is necessary, use the 3-ton floor jack and four 3-ton jack stands to raise and support your 4Runner evenly.
• Use the mechanic’s creeper to inspect the vehicle’s stability before reaching the transmission.

Step 2: Remove the Transmission Skid Plate if Necessary

• Use the 12mm socket and 3/8-inch-drive ratchet to remove the transmission skid-plate fasteners if the plate blocks the transmission pan.
• Support the plate with one hand while removing the final fastener. It is heavier than it appears.
• Set the plate and fasteners aside in their installed order.

Step 3: Loosen the Fill Plug First

• Put on the safety glasses and nitrile mechanic’s gloves.
• Locate the fill plug on the passenger side of the transmission case.
• Use the 24mm socket and 1/2-inch-drive breaker bar to loosen and remove the fill plug.
• Do not drain the transmission unless the fill plug can be removed. This prevents being left with an empty transmission that cannot be refilled.
• Inspect the plug threads and remove the old sealing washer.
• Always open the fill plug before draining.

Step 4: Drain the Old Fluid

• Place the 8-quart drain pan directly beneath the transmission drain plug.
• Use the 14mm socket and 3/8-inch-drive ratchet to remove the drain plug carefully.
• Allow the fluid to drain until it slows to an occasional drip.
• Use the graduated measuring container to measure the amount removed. A normal drain-and-refill commonly removes approximately 3-4 quarts.
• Inspect the fluid using the safety glasses and gloves. A dark color can be normal, but metal flakes, heavy debris, or a strong burned smell indicate that further diagnosis is needed.

Step 5: Service the Overflow Plug

• Locate the small overflow plug within the transmission-pan drain area. The overflow tube behind this plug establishes the correct fluid height.
• Use the 5mm hex-bit socket and 3/8-inch-drive ratchet to remove the overflow plug.
• Allow any remaining fluid to drain into the drain pan.
• Install a new overflow-plug sealing gasket.
• Use the 5mm hex-bit socket and inch-pound torque wrench to install the overflow plug. Torque to 1.7 Nm (15 in-lbs).
• Do not overtighten this small plug; the transmission-pan threads can be damaged easily.

Step 6: Reinstall the Drain Plug

• Use shop towels and brake cleaner to clean the drain plug and the sealing surface.
• Install a new drain-plug sealing washer.
• Thread the drain plug in by hand to prevent cross-threading.
• Use the 14mm socket and torque wrench to tighten the drain plug. Torque to 20 Nm (15 ft-lbs).

Step 7: Add New Transmission Fluid

• Attach the ATF fluid-transfer pump to a container of Toyota Genuine ATF WS or Toyota WS-approved fluid.
• Insert the pump hose into the transmission fill opening.
• Use the fluid-transfer pump to add approximately the same quantity measured during draining.
• Continue pumping until a small amount begins to run back out of the fill opening.
• Temporarily install the fill plug by hand with its new sealing washer. Do not perform final tightening yet.

Step 8: Circulate the New Fluid

• Lower your 4Runner with the 3-ton floor jack if it cannot be started safely while raised. Keep it level for the final check.
• Use the OBD-II scan tool to display the automatic transmission fluid temperature.
• Start the engine with your foot firmly on the brake pedal.
• Move the selector slowly through P > R > N > D, pausing approximately three seconds in each position.
• Use the selector to move through the available manual ranges, pausing approximately three seconds in each, and then return to Park.
• Leave the engine idling. Do not raise engine speed.

Step 9: Check the Fluid Level at the Correct Temperature

• Watch the OBD-II scan tool until the transmission-fluid temperature reaches 40-45°C (104-113°F).
• With the engine still idling and your 4Runner level, use the 5mm hex-bit socket and 3/8-inch-drive ratchet to remove the overflow plug.
• If fluid exits as a thin stream and then slows to a steady drip, the level is correct.
• If no fluid exits, use the ATF fluid-transfer pump through the fill opening to add Toyota WS fluid until it begins to overflow.
• If fluid pours out heavily, allow the excess to drain until only a thin stream or steady drip remains.
• Install the overflow plug with its gasket while the fluid is still within the specified temperature range.
• Use the 5mm hex-bit socket and inch-pound torque wrench to tighten it. Torque to 1.7 Nm (15 in-lbs).
• If the fluid temperature exceeds 45°C (113°F) before the level is set, reinstall the plugs, switch off the engine, allow the transmission to cool, and repeat this step.

Step 10: Tighten the Fill Plug

• Switch off the engine after completing the level check.
• Install a new fill-plug sealing washer if it was not already fitted.
• Use the 24mm socket and torque wrench to tighten the fill plug. Torque to 37 Nm (27 ft-lbs).
• Use shop towels and brake cleaner to remove spilled fluid from the transmission case and pan.

Step 11: Reinstall the Skid Plate

• Lift the transmission skid plate into position by hand.
• Start every fastener by hand before using tools.
• Use the 12mm socket and torque wrench to tighten the original skid-plate fasteners to their factory specification for their installed positions. Do not use an impact wrench.
• Use the 3-ton floor jack to lower your 4Runner if it remains on jack stands, then remove the four jack stands and wheel chocks.

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✅ After Repair

• ✅ Start the engine and verify that no warning lights remain illuminated.
• 🚙 With the brake applied, shift through every gear and confirm normal engagement.
• 🔍 Inspect the fill, drain, and overflow plugs for leaks while the engine is running and again after a short drive.
• 🛣️ Drive gently for 10-15 minutes. Confirm that shifts feel normal and then inspect beneath your 4Runner for fresh fluid.
• ♻️ Pour the used fluid into a sealed container and take it to an authorized automotive-fluid recycling facility. Do not pour it onto the ground or into a drain.
• 📝 No transmission reset, adaptation clearing, or coding is required after a routine drain-and-refill.

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💰 DIY vs Shop Cost

Shop Cost: ₹10,000-₹18,000 (parts + labor)

DIY Cost: ₹5,000-₹9,000 (parts only)

You Save: ₹5,000-₹9,000 by doing it yourself!

Labor rates around Sonīpat vary. This repair takes a shop approximately 1-2 hours, and imported Toyota WS fluid pricing can vary significantly.

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