🔧 Grand Cherokee - Transmission Fluid & Filter Service

On your Grand Cherokee, a proper transmission fluid change is usually done by removing the pan, replacing the filter, and refilling with the correct-spec ATF. The exact fluid type and fill/check method depends on which transmission you have (some are “sealed” and require a special dipstick tool and temperature-based level check).

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

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⚠️ Safety & Precautions

• ⚠️ Work on level ground and support the SUV with jack stands—never rely on a jack alone.
• ⚠️ Transmission fluid can be hot; let the transmission cool before opening the pan.
• ⚠️ Keep the vehicle level during the final fluid level check (front-to-back and side-to-side).
• ⚠️ Do not mix ATF types—wrong fluid can cause slipping or shifting issues.
• ⚠️ Battery disconnect is not required for this service.

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🔧 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)
• Socket set (8mm–13mm)
• Ratchet (3/8")
• Torque wrench (in-lb or low Nm capable)
• Plastic trim scraper
• Brake cleaner spray
• Shop towels
• Fluid transfer pump (hand pump)
• Infrared thermometer
• Transmission dipstick tool for NAG1/722.6 (specialty)
• Scan tool that reads transmission fluid temperature (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Transmission filter kit - Qty: 1
• Transmission pan gasket - Qty: 1
• Transmission fluid (correct spec for your transmission) - Qty: 6-8 quarts
• Drain plug seal washer (if equipped) - Qty: 1

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📋 Before You Begin

• Park on a level surface, set the parking brake, and place wheel chocks behind the rear tires.
• Raise the front and support the frame with jack stands so the SUV sits level.
• Identify your transmission type (important for the correct ATF and level check):
• NAG1 / W5A580 (Mercedes 722.6): usually no normal dipstick; level is checked with a special dipstick tool and fluid temperature.
• 545RFE: usually has a regular dipstick tube and uses a normal dipstick check.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Warm the transmission slightly

• Drive 5–10 minutes so the fluid flows better, then park on level ground.
• Let it cool 10–15 minutes so it’s warm, not burning hot.
• Warm fluid drains faster and carries more debris.

Step 2: Safely lift and level the SUV

• Use a floor jack to lift the front, then set it onto jack stands.
• Keep the SUV as level as possible; the final fluid level depends on it.

Step 3: Place the drain pan and remove any drain plug (if equipped)

• Position a drain pan under the transmission pan.
• If your pan has a drain plug, use the correct socket to remove it and drain fluid.
• If there is no drain plug, go to the next step and “crack” the pan loose to drain.

Step 4: Remove the transmission pan

• Use an 8mm–13mm socket (varies by pan) and a ratchet to loosen pan bolts evenly.
• Leave 2 bolts loosely threaded on one end, then gently lower the other side of the pan to pour fluid into the drain pan.
• Support the pan with one hand and remove the last bolts.

Step 5: Remove and replace the transmission filter

• Locate the filter above the pan.
• If it’s bolted on, use a small socket and ratchet to remove the screws.
• If it’s a push-in style, pull it straight down firmly.
• Install the new filter (make sure any O-ring seats fully).
• Filter must be fully seated or it can suck air.

Step 6: Clean the pan and magnets

• Remove the magnets from the pan and wipe off sludge using shop towels.
• Spray the pan clean with brake cleaner spray and wipe dry.
• Scrape old gasket material carefully using a plastic trim scraper.

Step 7: Reinstall the pan with a new gasket

• Position the new gasket on the pan and start all bolts by hand.
• Use a ratchet to snug bolts evenly in a crisscross pattern.
• Use a torque wrench to torque pan bolts to the correct spec:
• If NAG1/722.6: Torque to 8 Nm (71 in-lbs)
• If 545RFE: Torque to 13 Nm (115 in-lbs)

Step 8: Refill with the correct ATF

• Lower the SUV enough to access the fill point safely (keep it level for final checking).
• Use a fluid transfer pump (hand pump) to add fluid.
• Add about what drained out (typically 4–6 quarts for a pan-drop service), then do the level-check procedure below.

Step 9: Set the fluid level (choose your transmission path)

• Path A — NAG1 / W5A580 (sealed, temp-based check):
• Start the engine and keep your foot on the brake.
• Move the shifter slowly through P-R-N-D and back to P to fill passages.
• Use a scan tool that reads transmission fluid temperature (specialty) (best) or verify pan temp with an infrared thermometer.
• At the specified temp range (commonly checked around 80°C / 176°F), insert the transmission dipstick tool for NAG1/722.6 (specialty) into the dipstick tube and read the level.
• Add fluid in small amounts (0.25 quart at a time) with the fluid transfer pump until it reaches the correct mark for that temperature.
• Overfilling can cause foaming and bad shifting.
• Path B — 545RFE (standard dipstick check):
• Start the engine, shift through all gears, then leave it in Neutral or Park (per dipstick label).
• With fluid warm, check the dipstick and add ATF in small amounts using the fluid transfer pump.
• Recheck until it’s in the “HOT” range (after warming fully).

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✅ After Repair

• Start the engine and check for leaks around the pan gasket and drain plug.
• Test drive gently, then recheck for leaks.
• If you have a scan tool, check for stored transmission codes after the drive.
• Dispose of used ATF at a recycling center—don’t dump it.

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💰 DIY vs Shop Cost

Shop Cost: $300-$650 (parts + labor)

DIY Cost: $90-$220 (parts only)

You Save: $210-$430 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-3 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.