🔧 Transmission Fluid - Fluid Change

Your Tacoma’s manual transmission fluid should be drained and refilled while the truck is level so the fill level is correct. This service helps protect the gears, bearings, and synchronizers from wear and shifting problems.

Difficulty Level: Beginner | Estimated Time: 1-2 hours

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⚠️ Safety & Precautions

• Let the transmission cool before starting. The fluid can be hot.
• Keep the truck level during draining and filling. A wrong angle can give an incorrect fluid level.
• Use jack stands on solid ground. Never work under a truck supported only by a jack.
• Manual transmission fluid is not the same as engine oil or automatic transmission fluid.
• Battery disconnect is not required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• 24mm socket
• 3/8-inch ratchet
• Torque wrench
• Fluid pump or hand pump
• Drain pan
• Jack
• Jack stands
• Wheel chocks
• Safety glasses
• Nitrile gloves
• Shop towels
• Funnel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Manual transmission fluid 75W-90 gear oil - Qty: 2-3 quarts
• Drain plug gasket - Qty: 1
• Fill plug gasket - Qty: 1

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📋 Before You Begin

• Park on a flat surface and set the parking brake.
• Chock the rear wheels if the front of the truck is raised.
• Raise and support the truck so it sits level.
• Always loosen the fill plug first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen the fill plug

• Use a 24mm socket and 3/8-inch ratchet to loosen the fill plug on the transmission.
• Do not remove it yet. Just make sure it will come out before draining the fluid.

Step 2: Drain the old fluid

• Place a drain pan under the transmission.
• Use the 24mm socket and 3/8-inch ratchet to remove the drain plug.
• Let the fluid drain completely.
• Inspect the drain plug for metal debris. A small amount of fine paste is normal.

Step 3: Reinstall the drain plug

• Install a new drain plug gasket on the drain plug.
• Thread the plug in by hand first.
• Use a torque wrench and 24mm socket to tighten the drain plug to 39 Nm (29 ft-lbs).

Step 4: Fill the transmission

• Use a fluid pump or hand pump to add 75W-90 gear oil through the fill hole.
• Fill slowly until fluid just begins to seep back out of the fill opening.
• This is the correct level.

Step 5: Reinstall the fill plug

• Install a new fill plug gasket on the fill plug.
• Thread the plug in by hand first.
• Use a torque wrench and 24mm socket to tighten the fill plug to 39 Nm (29 ft-lbs).

Step 6: Clean up and lower the truck

• Wipe off any spilled fluid with shop towels.
• Lower the truck carefully.
• Check around both plugs for leaks.

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✅ After Repair

• Test drive the truck and verify smooth shifting.
• Recheck both plugs for leaks after the test drive.
• If shifting feels rough, confirm the truck was level during filling.

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💰 DIY vs Shop Cost

Shop Cost: $180-$300 (parts + labor)

DIY Cost: $40-$90 (parts only)

You Save: $140-$210 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.