🔧 Forte - Transmission Fluid Drain & Fill

A transmission fluid change on your Forte is typically a drain-and-fill (not a full “flush”). You’ll drain the old fluid, then refill with the correct Kia-spec ATF and verify the level so shifting stays smooth and the transmission stays protected.

Difficulty Level: Intermediate | Estimated Time: 1.0-2.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a level surface and support the car with jack stands—never rely on a floor jack alone.
• ⚠️ Transmission fluid can be hot. Let the car cool if needed and wear gloves and safety glasses.
• ⚠️ Keep the vehicle level while checking/finalizing fluid level, or the level will be wrong.
• ⚠️ Use only the correct ATF spec for your Forte. Mixing fluids can cause shift problems.
• 🔋 Battery disconnect is not required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (pair, rated 3-ton minimum)
• Wheel chocks (pair)
• Safety glasses
• Nitrile gloves
• Drain pan (8-quart minimum)
• Funnel with long neck
• Fluid transfer pump (specialty)
• Socket set (metric)
• Ratchet (3/8" drive)
• Torque wrench (3/8" drive, 10–100 ft-lbs range)
• Trim clip remover
• Flathead screwdriver
• Shop rags

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid (ATF), Kia-spec SP-IV - Qty: 4 quarts
• Transmission drain plug crush washer - Qty: 1
• Transmission fill/level plug crush washer - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear tires.
• Warm the transmission slightly with a 5–10 minute drive so the fluid drains better, then shut the engine off.
• Raise the front with a floor jack and support with jack stands at the proper lift points.
• A “crush washer” is a soft metal ring that seals the plug.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the lower splash shield (if equipped)

• Use a trim clip remover and flathead screwdriver to remove the plastic clips/screws.
• Use a metric socket and ratchet for any bolts holding the shield.
• Set the shield and clips aside where they won’t get lost.

Step 2: Identify the drain and fill points

• Place your drain pan under the transmission pan/case area.
• Locate the drain plug on the transmission case.
• Locate your refill method (two common setups):
• Dipstick-style: you’ll refill through the dipstick tube using a funnel with long neck.
• Sealed/no dipstick: you’ll refill through a fill plug using a fluid transfer pump (a hand pump that pushes fluid from the bottle into the transmission).
• Pro tip: Always loosen the fill point first.

Step 3: Crack loose the fill point (important)

• Dipstick-style: Pull the dipstick up to confirm it’s accessible; wipe it with a shop rag.
• Sealed/no dipstick: Use the correct socket and ratchet to loosen the fill plug slightly, then snug it back by hand.
• This prevents getting stuck with an empty transmission you can’t refill.

Step 4: Drain the old transmission fluid

• Use the correct socket and ratchet to remove the drain plug.
• Let the fluid drain until it slows to a drip (usually 10–15 minutes).
• Inspect the drain plug for metal fuzz (a light “paste” is normal; chunks are not).

Step 5: Reinstall the drain plug with a new crush washer

• Install a new drain plug crush washer on the drain plug.
• Thread the plug in by hand first to avoid cross-threading.
• Use a torque wrench to tighten: Torque to 39 Nm (29 ft-lbs).

Step 6: Refill with the correct ATF

• Measure what drained out (look at the drain pan markings) and plan to add about the same amount.
• Dipstick-style: Use a funnel with long neck and pour in Kia-spec SP-IV ATF slowly.
• Sealed/no dipstick: Use a fluid transfer pump (specialty) to pump Kia-spec SP-IV ATF into the fill hole.
• Add fluid in small amounts to avoid overfilling.

Step 7: Set/check the fluid level

• Start the engine and keep your foot on the brake.
• Move the shifter slowly through P-R-N-D and back to P, pausing 2–3 seconds in each gear.
• Dipstick-style: With the engine idling, pull the dipstick, wipe with a shop rag, reinsert, and check level. Add ATF through the funnel until it’s at the correct mark.
• Sealed/no dipstick: With the engine idling and vehicle level, remove the level/fill plug using the correct socket and ratchet. Add ATF with the fluid transfer pump until fluid just begins to trickle out, then reinstall the plug with a new crush washer.

Step 8: Reinstall splash shield and lower the car

• Reinstall the splash shield using the metric socket, ratchet, trim clip remover, and flathead screwdriver.
• Lower the car safely using the floor jack.

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✅ After Repair

• Start the engine and check underneath for leaks around the drain/fill points.
• Test drive 10–15 minutes. Confirm smooth shifts and no slipping.
• Re-check the fluid level one more time (same method you used above).
• Dispose of used ATF properly—most parts stores accept waste fluid.

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💰 DIY vs Shop Cost

Shop Cost: $200-$350 (parts + labor)

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

You Save: $110-$310 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.5 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.