🔧 Transmission Fluid - Drain and Refill

This procedure replaces the transmission fluid by draining the pan and refilling with the correct Toyota-spec fluid. It is the safest DIY service for your RAV4 automatic transmission and helps keep shift quality smooth.

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

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⚠️ Safety & Precautions

• Work on a level surface. The fluid level must be checked with the vehicle level.
• The transmission fluid may be hot. Wear gloves and safety glasses.
• Use only Toyota WS or equivalent fluid that meets Toyota WS specification.
• Do not overfill. The fluid level is set by temperature and overflow at the check plug.
• A lift or four jack stands is strongly preferred to keep the vehicle level.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch drive ratchet
• 10mm socket
• 24mm socket
• Torque wrench
• Fluid transfer pump
• Drain pan
• Funnel
• Jack stands rated for vehicle weight
• Floor jack rated 3-ton minimum
• Safety glasses
• Nitrile gloves
• Rags or shop towels
• Scan tool or infrared thermometer

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid - Toyota WS - Qty: 4-5 quarts
• Transmission drain plug gasket - Qty: 1
• Transmission overflow/check plug gasket - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Raise and support the vehicle so it stays level.
• Warm the transmission with a short drive so the fluid drains more completely.
• Have the new fluid and pump ready before opening the fill plug.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the under cover

• Use the 10mm socket and ratchet to remove the lower engine under cover fasteners.
• Set the cover and fasteners aside in order.

Step 2: Loosen the fill plug first

• Use the 24mm socket to loosen the transmission fill plug before draining.
• This confirms you can refill it later. Never drain first and find a stuck fill plug.

Step 3: Drain the old fluid

• Place the drain pan under the transmission drain plug.
• Use the 24mm socket to remove the drain plug and let the fluid drain fully.
• Replace the drain plug gasket with a new one.
• Torque the drain plug to 40 Nm (30 ft-lbs).

Step 4: Reinstall the drain plug

• Install the drain plug with the new gasket by hand first.
• Use the torque wrench and 24mm socket to tighten it.
• Torque to 40 Nm (30 ft-lbs).

Step 5: Add fresh fluid

• Use the fluid transfer pump and funnel to add Toyota WS fluid through the fill opening.
• Add about the same amount that drained out, then leave room for final level setting.
• Install the fill plug finger-tight for now.

Step 6: Set the fluid level

• Start the engine and move the shifter through all gear positions, pausing a few seconds in each.
• Keep the engine running and monitor transmission fluid temperature with a scan tool or infrared thermometer.
• When fluid temperature is in the correct check range, remove the overflow/check plug carefully with the 24mm socket.
• Add fluid through the fill hole until a thin stream drips from the overflow opening.
• When it slows to a steady drip, reinstall the overflow/check plug.
• Torque the overflow/check plug to 49 Nm (36 ft-lbs).

Step 7: Final tighten and reassemble

• Install the fill plug fully and tighten it with the 24mm socket.
• Torque the fill plug to 40 Nm (30 ft-lbs).
• Reinstall the under cover using the 10mm socket.

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✅ After Repair

• Road test the vehicle and confirm smooth shifts.
• Check underneath for leaks after the test drive.
• Recheck for drips from the drain, fill, and overflow plugs.
• If shifts feel abnormal, recheck fluid level using the temperature-based procedure.

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💰 DIY vs Shop Cost

Shop Cost: $180-$320 (parts + labor)

DIY Cost: $55-$120 (parts only)

You Save: $125-$200 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-2 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.