🔧 Transit Connect - Transmission Fluid Drain, Fill & Level Check

Your Transit Connect’s automatic transmission fluid should be refreshed to keep shifting smooth and reduce wear. This job is usually a drain-and-fill (not a full “flush”), then you set the fluid level using the transmission’s level/check plug at a specific fluid temperature.

Difficulty Level: Intermediate | Estimated Time: 1.5-3 hours

Assumption: This uses the 6-speed automatic that takes MERCON LV and has a check/overflow level plug (common on this model).

---

⚠️ Safety & Precautions

• ⚠️ Work on a flat surface; support the van with jack stands before going underneath.
• ⚠️ Transmission fluid can be hot; wear gloves and safety glasses.
• ⚠️ Keep the engine running only when instructed, and keep hands/clothes away from belts and fans.
• ⚠️ Do not crawl under the van supported only by a jack.
• 🔋 Battery disconnect is not required for a drain-and-fill.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• Drain pan (10-quart minimum)
• Shop towels
• Brake cleaner spray
• 3/8" drive ratchet
• 3/8" drive extension set
• Socket set (8mm-19mm)
• Allen key socket set (5mm-10mm)
• Torque wrench (10-50 Nm range)
• Fluid transfer pump (specialty)
• OBD-II scan tool with transmission fluid temperature data (specialty)
• Trim clip tool
• Flathead screwdriver

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Automatic transmission fluid (MERCON LV) - Qty: 5 quarts
• Drain plug sealing washer - Qty: 1
• Fill plug sealing washer - Qty: 1

---

📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks at the rear wheels.
• Warm the transmission with a 10–15 minute drive so the fluid drains more completely.
• Plan to keep the van level while checking the final fluid level (this matters a lot).
• Connect your OBD-II scan tool and make sure you can view Transmission Fluid Temperature (TFT) (that’s the temperature reading used to set the level).

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and level the van

• Use a floor jack (rated 3-ton minimum) to lift the front, then set it down onto jack stands (rated 3-ton minimum).
• Use wheel chocks to keep it from rolling.
• Confirm the van is stable and reasonably level side-to-side.

Step 2: Remove the lower splash shield (if equipped)

• Use a trim clip tool and flathead screwdriver to remove the plastic clips.
• Use an 8mm socket with a 3/8" drive ratchet to remove any small bolts.
• Set the shield and fasteners aside where you won’t lose them.

Step 3: Locate the drain plug and level/check plug

• Place a drain pan (10-quart minimum) under the transmission.
• Clean around plugs using brake cleaner spray and shop towels so dirt can’t fall in.
• Tip: Clean first to prevent contamination.

Step 4: Loosen the fill plug first

• Before draining anything, loosen the transmission fill plug using the appropriate socket (often 19mm) and a 3/8" drive ratchet.
• This is your “insurance”: if it won’t open, do not drain the fluid.
• Once it cracks loose, snug it back by hand for now.

Step 5: Drain the old transmission fluid

• Use the appropriate socket or Allen key socket (varies by plug style) with a 3/8" drive ratchet to remove the drain plug.
• Let the fluid drain until it slows to an occasional drip.
• Replace the drain plug sealing washer, then reinstall the drain plug.
• Torque to 35 Nm (26 ft-lbs)

Step 6: Measure what came out

• Pour the drained fluid into a marked container (or note the amount if your drain pan has markings).
• This helps you refill close to the correct amount before the final level check.

Step 7: Refill with new MERCON LV fluid

• Remove the fill plug fully using a 19mm socket (if applicable) and a 3/8" drive ratchet.
• Use a fluid transfer pump (specialty) to pump in MERCON LV.
• Add roughly the same amount you drained, then reinstall the fill plug lightly (hand snug) for now.

Step 8: Run the shifter to fill circuits

• Start the engine and keep your foot on the brake.
• Move the shifter slowly: P-R-N-D and back, pausing 2–3 seconds in each position.
• Do this 2–3 times to circulate fluid through the valve body and torque converter.

Step 9: Set the fluid level at the correct temperature

• With the engine idling, use your OBD-II scan tool with transmission fluid temperature data (specialty) to watch TFT.
• When TFT is in the typical level-check window of 85–95°C (185–203°F), remove the transmission level/check plug using the correct Allen key socket or socket and a 3/8" drive ratchet.
• Correct level behavior: a thin stream/drip comes out, then slows to a drip.
• If no fluid comes out, add fluid through the fill port using the fluid transfer pump (specialty), then re-check.
• If fluid pours out heavily, wait until it slows to a drip, then reinstall the level/check plug.
• Torque to 12 Nm (106 in-lbs)
• Tip: Level checks must be done with the van level.

Step 10: Final tighten and reassemble

• Remove and reinstall the fill plug with a new sealing washer using a 19mm socket and 3/8" drive ratchet.
• Torque to 35 Nm (26 ft-lbs)
• Reinstall the splash shield using the trim clip tool, flathead screwdriver, and 8mm socket.
• Lower the van using the floor jack (rated 3-ton minimum).

---

✅ After Repair

• Test drive 10–15 minutes and verify normal shifting.
• Park, let it idle, and inspect underneath for leaks around the drain, level, and fill plugs.
• If you notice delayed engagement, flare (RPM jump), or slipping, re-check level at the proper TFT window using the OBD-II scan tool with transmission fluid temperature data (specialty).
• Dispose of old ATF properly (many parts stores accept used fluids).

---

💰 DIY vs Shop Cost

Shop Cost: $220-$450 (parts + labor)

DIY Cost: $45-$110 (parts only)

You Save: $175-$340 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3 hours.

---

🎯 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.