Changing transmission fluid in a 2018 Jeep Grand Cherokee requires specific ATF+4 fluid and careful attention to the fill procedure. A 2018 jeep grand cherokee transmission fluid change is not just about draining old fluid; it involves checking levels at a specific temperature and using the correct equipment. Many owners overlook this service, which can lead to rough shifting or costly repairs down the road. This guide walks you through the entire process, from why it matters to the exact steps you need to follow.
Your Grand Cherokee’s transmission is a sealed unit in many ways, but the fluid still degrades over time. Heat and friction break down the additives, leaving sludge and varnish behind. Regular fluid changes keep the transmission cool and lubricated, extending its life significantly.
Why A 2018 Jeep Grand Cherokee Transmission Fluid Change Matters
The 2018 Grand Cherokee uses a ZF 8-speed automatic transmission, which is known for smooth shifts and durability. However, this transmission is sensitive to fluid condition. Using the wrong fluid or skipping changes can cause hesitation, shuddering, or even complete failure.
Jeep recommends inspecting the fluid at 60,000 miles, but many mechanics suggest a full change every 30,000 to 50,000 miles, especially if you tow or drive in stop-and-go traffic. The fluid not only lubricates but also acts as a hydraulic medium for the valve body and torque converter. Old fluid loses its viscosity and thermal stability, leading to increased wear.
Another reason to change the fluid is to remove contaminants. Metal shavings and clutch material accumulate over time. While the transmission has a filter, a fluid change helps flush out fine particles that can clog passages.
Signs You Need A Transmission Fluid Change
Watch for these warning signs:
- Delayed engagement when shifting from Park to Drive or Reverse
- Rough or jerky shifts, especially between gears
- Whining or buzzing noises from the transmission
- Burning smell from the dipstick area (if equipped)
- Fluid that looks dark brown or smells burnt
If you notice any of these, check the fluid level and condition immediately. Ignoring them can lead to expensive repairs.
Tools And Materials Needed For The Job
Before starting, gather the following items. Using the right tools makes the job safer and more accurate.
Required Fluids And Parts
- ATF+4 automatic transmission fluid (Mopar or equivalent) – about 5 to 7 quarts for a drain and fill
- New transmission pan gasket (if pan is removed)
- New transmission filter (if servicing the pan)
- Drain plug washer (if equipped)
Tools You Will Need
- Floor jack and jack stands (or ramps)
- Socket set with metric sizes (10mm, 13mm, 15mm, 18mm)
- Torque wrench
- Drain pan (at least 8-quart capacity)
- Funnel with a long, flexible neck
- Scan tool or thermometer to check fluid temperature (optional but recommended)
- Shop rags and gloves
Make sure you have a clean workspace. The transmission fill plug is on the side of the case, and the drain plug is on the bottom of the pan. Some models have a fill tube with a dipstick, but many 2018 Grand Cherokees use a sealed system with a check plug.
Step-By-Step: 2018 Jeep Grand Cherokee Transmission Fluid Change
Follow these steps carefully. The process is straightforward but requires patience, especially when setting the correct fluid level.
Step 1: Prepare The Vehicle
Park the Jeep on a level surface. Engage the parking brake. Jack up the front of the vehicle and place it securely on jack stands. You need enough clearance to reach the transmission pan and fill plug. If you have ramps, those work well too.
Let the engine cool down if it has been running. The transmission fluid should be warm but not hot to avoid burns.
Step 2: Locate The Drain And Fill Plugs
Underneath the vehicle, locate the transmission pan. It is a rectangular metal pan bolted to the bottom of the transmission. The drain plug is usually at the lowest point of the pan. On some models, there is also a fill plug on the side of the transmission case, near the front or rear.
If your Grand Cherokee has a dipstick, the fill tube is on top of the transmission. For sealed systems, you will need to remove the fill plug to add fluid.
Step 3: Drain The Old Fluid
Place the drain pan under the transmission pan. Remove the drain plug using a socket or Allen key, depending on your model. Let the fluid drain completely. This may take 5 to 10 minutes. Be careful—the fluid can be hot.
If your pan does not have a drain plug, you will need to remove the entire pan. Loosen the pan bolts in a crisscross pattern, then carefully pry the pan loose. Some fluid will spill, so have rags ready.
Step 4: Replace The Filter And Gasket (If Pan Is Removed)
If you removed the pan, clean it thoroughly with brake cleaner. Remove the old filter, which is usually held by a few bolts or clips. Install the new filter and tighten the bolts to spec. Clean the mating surface on the transmission, then install the new gasket and reattach the pan. Torque the pan bolts to 8-10 ft-lbs in a crisscross pattern.
If you only did a drain plug service, you can skip this step. However, changing the filter is recommended every other fluid change.
Step 5: Refill With ATF+4 Fluid
Locate the fill port. If you have a dipstick tube, use a funnel to pour fluid into the tube. For sealed systems, remove the fill plug on the side of the transmission and use a pump or squeeze bottle to add fluid through that hole.
Add about 4 to 5 quarts initially. Do not overfill. The exact amount depends on how much drained out. Most drain and fill procedures replace about 40-50% of the total fluid, so you will need to check the level carefully.
Step 6: Check And Adjust Fluid Level
This is the most critical step. The transmission fluid level must be checked at the correct temperature—usually between 100°F and 120°F (38°C to 49°C). Start the engine and let it idle. Shift through all gears (P, R, N, D) pausing for a few seconds in each. Return to Park.
With the engine running, check the fluid level. For dipstick models, pull the dipstick, wipe it, reinsert, and check. The fluid should be between the “Cold” and “Hot” marks. For sealed systems, remove the fill plug while the engine is idling. Fluid should trickle out. If it does not, add more fluid until it just starts to drip.
If you have a scan tool, monitor the transmission temperature. If not, let the engine idle for about 5 minutes after a short drive to warm the fluid.
Step 7: Reinstall Plugs And Test Drive
Once the level is correct, reinstall the fill plug or dipstick. Tighten the drain plug to 18-20 ft-lbs. Lower the vehicle. Take a short test drive, shifting through all gears. Listen for smooth operation and check for leaks around the pan and plugs.
After the test drive, recheck the fluid level one more time. It is common to need a small adjustment after the first drive.
Common Mistakes To Avoid
Many DIYers make errors during a 2018 Jeep Grand Cherokee transmission fluid change. Here are the most frequent ones and how to avoid them.
Using The Wrong Fluid
Never use Dexron or generic universal fluid. The 2018 Grand Cherokee requires ATF+4. Using the wrong fluid can cause harsh shifting, slipping, or transmission damage. Always check the owner’s manual or the fill cap for the correct spec.
Overfilling Or Underfilling
Overfilling causes foaming and overheating, which leads to erratic shifting. Underfilling starves the transmission of lubrication. Always check the level at the correct temperature and with the engine running.
Not Replacing The Filter
While not strictly necessary every time, skipping the filter change means old contaminants remain in the system. If you remove the pan, always replace the filter. It is inexpensive and adds protection.
Ignoring The Torque Converter Drain
Some models have a drain plug on the torque converter. If you want to replace more fluid, you can drain the converter as well. This requires removing the access cover on the bell housing. Be careful not to strip the plug.
When To Seek Professional Help
If you are not comfortable working under the vehicle or dealing with transmission fluid, take it to a shop. A professional flush machine can replace nearly all the old fluid, which is more thorough than a drain and fill. However, some shops use generic fluid, so specify ATF+4.
Also, if your transmission has symptoms of internal damage (loud noises, slipping, or metal shavings in the fluid), a simple fluid change may not fix it. In that case, a full rebuild or replacement might be necessary.
Cost Comparison: DIY Vs. Shop
Doing the job yourself costs about $60 to $100 for fluid, filter, and gasket. A shop will charge $200 to $400 for a drain and fill, and $300 to $600 for a full flush. The labor is the main cost, as the process takes about an hour.
If you have basic tools and a weekend afternoon, DIY saves money and gives you control over the fluid quality. Just be patient with the level check.
Frequently Asked Questions
How often should I change the transmission fluid on a 2018 Jeep Grand Cherokee?
Jeep says to inspect the fluid every 60,000 miles. Many owners change it every 30,000 to 50,000 miles for best performance, especially if you tow or drive in heavy traffic.
Can I use any brand of ATF+4 fluid?
Yes, as long as it meets the ATF+4 specification. Mopar brand is recommended, but brands like Valvoline, Castrol, and Mobil 1 make compatible fluids. Avoid fluids that say “universal” or “multi-vehicle” unless they specifically list ATF+4.
Do I need to reset the transmission adaptive learning after a fluid change?
It is not required, but some owners report smoother shifts after a reset. You can do this with a scan tool or by disconnecting the battery for 30 minutes. The transmission will relearn your driving habits over a few miles.
What happens if I overfill the transmission fluid?
Overfilling causes foaming, which reduces lubrication and cooling. The transmission may shift erratically or overheat. If you overfill, drain some fluid through the drain plug until the level is correct.
Is a transmission flush safe for my 2018 Grand Cherokee?
A flush is safe if done correctly with the right equipment and fluid. However, high-mileage transmissions with old, thick fluid may develop leaks after a flush because the new fluid cleans out sludge that was sealing gaps. In that case, a drain and fill is gentler.
Final Thoughts On The Procedure
Changing the transmission fluid on a 2018 Jeep Grand Cherokee is a manageable DIY task if you follow the steps precisely. The key is using ATF+4 fluid and checking the level at the right temperature. Take your time, especially during the refill and level check.
Regular fluid changes keep your Grand Cherokee’s transmission shifting smoothly for years. If you are unsure about any step, consult a repair manual or watch a video specific to your model year. A little prevention goes a long way in avoiding a costly rebuild.
Remember, the 2018 Jeep Grand Cherokee transmission fluid change is not just maintenance—it is an investment in your vehicle’s reliability. Do it right, and your Jeep will reward you with dependable performance.