🔧 Trax - Automatic Transmission Fluid Drain and Refill

This procedure replaces part of the fluid in your Trax’s GM 6T40 six-speed automatic transmission. A drain and refill is safer than a power flush and requires a final fluid-level check at a specific transmission temperature.

Assumption: This procedure applies to the stock U.S.-market six-speed automatic transmission; the transmission fluid, not the transfer case or rear differential, is being serviced.

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

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⚠️ Safety & Precautions

• ⚠️ The Trax must be level and securely supported at all four corners. Never work beneath a vehicle supported only by a jack.
• ⚠️ The final level check is performed with the engine running. Keep hands, clothing, and tools away from the cooling fan, belts, and exhaust.
• ⚠️ Transmission fluid reaches approximately 85-95°C (185-203°F) during the level check and can cause serious burns.
• ⚠️ Do not use a power-flush machine or add cleaners, conditioners, or universal transmission fluid.
• ⚠️ Incorrect fluid level can cause slipping, delayed engagement, foaming, overheating, or transmission damage.
• Battery disconnection is not required.

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🔧 Required Tools

You'll need the following tools for this repair:

• Hydraulic floor jack rated 2-ton minimum
• Jack stands rated 2-ton minimum, set of four
• Wheel chocks rated for passenger vehicles
• Metric socket set, 8-15mm
• 10mm socket
• 11mm socket
• 3/8-inch drive ratchet
• 3/8-inch drive extension, 6-inch
• Torque wrench, 5-30 Nm range
• OBD-II scan tool with transmission-fluid-temperature data (specialty)
• Fluid transfer pump with flexible hose (specialty)
• Drain pan with 8-quart minimum capacity
• Graduated fluid measuring container, 6-quart capacity
• Digital level, 12-inch
• Plastic trim-clip removal tool
• Shop funnel with flexible neck
• Shop towels
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• DEXRON-VI automatic transmission fluid - Qty: 6 quarts
• Transmission drain-plug seal - Qty: 1
• Transmission fluid-level plug seal - Qty: 1

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📋 Before You Begin

• 📍 Park your Trax on firm, level pavement and apply the parking brake.
• Allow the transmission to cool enough that its case and fluid will not burn you.
• Confirm every fluid container is labeled DEXRON-VI. Do not substitute CVT fluid or DEXRON-HP.
• Use the digital level to confirm the raised vehicle is level from front to rear and side to side.
• Connect the OBD-II scan tool before the final level check. A scan tool reads the temperature reported by the transmission control system.
• Measure the drained fluid so the same approximate quantity can be installed before setting the exact level.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Warm and position the vehicle

• Drive your Trax for approximately 10 minutes so contaminants remain suspended in the fluid.
• Park on level ground, move the shifter to Park, apply the parking brake, and switch off the engine.
• Place the wheel chocks firmly against the tires before lifting.

Step 2: Raise and support the Trax

• Use the hydraulic floor jack at the approved structural lifting points.
• Place all four jack stands beneath the approved support points, then lower the vehicle carefully onto them.
• Use the digital level on a flat body or chassis surface. Adjust the supports until the vehicle is level in both directions.
• Push the vehicle gently to verify that all four stands are stable.

Step 3: Remove the lower splash shield

• Wear safety glasses and nitrile gloves.
• Use the plastic trim-clip removal tool and the matching socket from the 8-15mm metric socket set to remove the lower shield fasteners.
• Lower the shield and place its fasteners in order for installation.

Step 4: Confirm the fill opening can be accessed

• Locate the transmission fill cap on top of the transmission, below the engine-compartment area near the battery tray.
• Clean around the cap with shop towels so dirt cannot enter.
• Loosen the cap by hand before draining any fluid. Do not continue if the cap cannot be removed.
• Reinstall the cap loosely to prevent contamination while draining.

Step 5: Drain the old transmission fluid

• Place the 8-quart drain pan beneath the transmission drain plug at the bottom of the case.
• Use the 11mm socket, 3/8-inch ratchet, and 6-inch extension to loosen the drain plug carefully.
• Remove the plug by hand and allow the fluid to drain until it slows to an occasional drip.
• Inspect the fluid for metallic flakes, heavy sludge, or a strong burned odor. Fine gray paste on a magnetic plug can be normal; chips are not.
• Pour the old fluid into the graduated measuring container and record the quantity.

Step 6: Reinstall the drain plug

• Clean the drain plug and sealing surface with shop towels.
• Install a new drain-plug seal and start the plug by hand to prevent cross-threading.
• Use the 11mm socket and torque wrench to tighten the drain plug to 12 Nm (106 in-lbs).
• Stop immediately if the plug will not thread easily.

Step 7: Add the initial fluid quantity

• Remove the upper fill cap by hand.
• Use the shop funnel to add the same quantity of fresh DEXRON-VI fluid that was drained.
• A normal drain commonly removes about 4-5 quarts, but use the measured amount rather than relying on an estimate.
• Reinstall the fill cap by hand until fully seated.

Step 8: Circulate the new fluid

• Connect the OBD-II scan tool to the diagnostic connector below the driver-side instrument panel.
• Start the engine while your Trax remains level on all four jack stands.
• Hold the brake pedal firmly. Move the shifter slowly through Park, Reverse, Neutral, Drive, and Manual mode, pausing about three seconds in each position.
• Return the shifter to Park and leave the engine idling.
• Use the scan tool to display transmission fluid temperature.

Step 9: Bring the fluid into the checking range

• Monitor transmission fluid temperature with the OBD-II scan tool until it reaches 85-95°C (185-203°F).
• Keep the engine idling, the shifter in Park, and the vehicle level.
• Do not place any part of your body near the exhaust or rotating engine components.

Step 10: Set the final fluid level

• Place the drain pan under the fluid-level plug on the transmission case.
• With the engine still idling, use the 10mm socket, ratchet, and extension to remove the fluid-level plug carefully.
• If fluid exits as a small stream and then becomes a slow drip, allow it to reach a slow drip. The level is correct.
• If no fluid exits, remove the upper fill cap by hand. Use the fluid transfer pump and flexible hose to add DEXRON-VI in small amounts until fluid begins dripping from the level opening.
• Keep the scan-tool temperature within 85-95°C (185-203°F). If it exceeds that range, reinstall the plug, shut off the engine, and allow the transmission to cool before repeating the check.

Step 11: Install the fluid-level plug

• Install a new seal on the cleaned fluid-level plug.
• Start the plug by hand, then use the 10mm socket and torque wrench to tighten it to 12 Nm (106 in-lbs).
• Wipe the drain plug and level-plug areas clean with shop towels.
• Reinstall the upper fill cap firmly by hand.

Step 12: Reinstall the splash shield

• Switch off the engine and disconnect the OBD-II scan tool.
• Position the lower splash shield and start every fastener by hand.
• Use the plastic trim-clip removal tool and matching socket from the 8-15mm metric socket set to secure the original clips and bolts without overtightening them.

Step 13: Lower the vehicle

• Use the hydraulic floor jack to raise each end enough to remove the jack stands.
• Lower your Trax slowly to the ground and remove the wheel chocks.
• Check beneath the vehicle for fresh leaks.

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✅ After Repair

• ✅ Start the engine and verify that Reverse and Drive engage smoothly without excessive delay.
• Take a gentle 10-15 minute test drive. Avoid hard acceleration while checking shift quality.
• Park on clean, level pavement and inspect the drain plug and fluid-level plug for leaks.
• Recheck for leakage after the next two drives.
• A transmission adaptation reset is not required for a routine drain and refill.
• Dispose of the old fluid at an authorized recycling or hazardous-waste collection facility. Never pour it onto the ground or into a drain.
• If the old fluid contained metal chips, smelled severely burned, or the transmission slips after the service, stop driving and arrange professional diagnosis.

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💰 DIY vs Shop Cost

Shop Cost: ₹9,000-₹16,000 (parts + labor)

DIY Cost: ₹4,000-₹7,000 (fluid and seals only)

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

Local labor rates vary. This repair takes a shop approximately 1-2 hours.

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🎯 Ready to get started?

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