What Automatic Transmission is in a Jeep Cherokee XJ 2000?
Reading Time: 8 minutes The Jeep Cherokee XJ from the year 2000 is a favorite among SUV fans and off-road drivers. Its design is simple, reliable, and easy to maintain. One key part that makes the XJ special is its automatic transmission. Many new owners or car enthusiasts want to know what automatic transmission the 2000 Jeep Cherokee XJ uses, how it works, and why it’s important. This article will answer these questions in detail, using simple English and clear examples.
What Is An Automatic Transmission?
An automatic transmission is a system that changes the gears of your car automatically. Unlike a manual transmission, you do not have to use a clutch or shift gears yourself. The car’s computer and transmission work together to choose the right gear for the speed and load.
For beginners, think of it like this: You push the gas pedal, and the car speeds up. The transmission shifts gears by itself to keep the engine running smoothly. You do not need to do anything extra except focus on driving.
The 2000 Jeep Cherokee Xj: Transmission Overview
The 2000 Jeep Cherokee XJ came with two main transmission types:
- Automatic transmission
- Manual transmission
This article will focus on the automatic transmission found in this model. Most 2000 Jeep Cherokee XJs with automatic transmissions came with the AW4 transmission.
Aw4 Automatic Transmission
The Aisin-Warner AW4 is a four-speed automatic transmission. It was used in Jeep Cherokees from 1987 to 2001. For the 2000 model year, almost all automatic XJs had this transmission.
Key features:
- 4 forward gears for smooth driving
- Overdrive gear for better fuel economy
- Electronically controlled shifting for smarter gear changes
The AW4 is known for being strong, reliable, and able to handle both city and off-road driving.
How The Aw4 Transmission Works
The AW4 uses hydraulics and electronics to shift gears. It senses the speed of the car, engine power, and throttle position. Then, it picks the best gear.
Here’s a basic flow:
- You put the gear selector in “Drive.”
- As you speed up, the transmission shifts from first to second, then to third, and finally to fourth.
- If you slow down, it downshifts to a lower gear.
- The overdrive (fourth gear) helps save gas on highways.
- The car’s computer helps control when to shift for smoothness and power.
Key Specifications Of The Aw4 Transmission
Here’s a quick look at important specs:
| Specification | AW4 Transmission |
|---|---|
| Number of Gears | 4 (including overdrive) |
| Transmission Fluid Type | Dexron II/III ATF |
| Fluid Capacity | ~8.5 quarts (dry fill) |
| Weight | Approx. 135 lbs |
| Torque Rating | Up to 300 lb-ft |
Credit: www.redlineautoparts.com
Why The Aw4 Is Popular In The Xj
Many Jeep fans love the AW4 for several reasons:
- Durability: It can last over 200,000 miles with good care.
- Simple repairs: Many parts are available, and it’s easy to service.
- Handles power: It works well with the Jeep’s 4.0L engine.
- Good for off-road: It performs well in tough conditions.
How To Identify The Aw4 Transmission
If you own a 2000 Jeep Cherokee XJ and want to check if you have an AW4, look for these:
- Gear shift pattern: PRND21 (Park, Reverse, Neutral, Drive, 2, 1)
- Transmission pan: The AW4 has a pan shape with 14 bolts (rectangular with a bump-out).
- Label on driver’s door: Sometimes the transmission code is listed.
- Transmission tag: Located on the passenger side of the transmission.
Common Problems And Solutions
While the AW4 is reliable, it can still develop issues over time. Some common problems include:
- Delayed shifting: May be caused by old or low fluid.
- Slipping gears: Worn out bands or clutches.
- No overdrive: Could be a faulty solenoid or sensor.
- Leaking fluid: Old gaskets or seals.
Practical solutions:
- Check and change the transmission fluid every 30,000 miles.
- Use the right ATF (Dexron II/III).
- Inspect for leaks under the car.
- Listen for unusual noises or rough shifting.
Early maintenance can prevent most expensive repairs.
Aw4 Transmission Vs. Other Jeep Transmissions
The AW4 is not the only automatic transmission used in Jeeps. Here’s a comparison with two others:
| Transmission | Years Used | Number of Gears | Best Use |
|---|---|---|---|
| AW4 | 1987-2001 | 4 | XJ Cherokee (4.0L engine) |
| 32RH | 1994-2001 (Wrangler) | 3 | Wrangler TJ, not XJ |
| 45RFE | 2002 and later | 4 | Grand Cherokee (WJ) |
The AW4 stands out for its extra gear and smooth operation.
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How To Maintain An Aw4 Transmission
Keeping your AW4 healthy does not require expert skills. Here are some practical tips:
- Check the fluid level: Once a month, with the engine running and in “Park.”
- Change the fluid and filter: Every 30,000 miles or 2 years.
- Inspect for leaks: Look under the car after parking overnight.
- Warm up in cold weather: Let the Jeep idle for a minute on cold mornings.
- Don’t tow too heavy: Follow the owner’s manual towing limits.
Proper care can help your transmission last for years.
Fluid Change Example
To change the AW4 transmission fluid:
- Park the car on a level surface.
- Remove the pan bolts and drain old fluid.
- Replace the filter and pan gasket.
- Reinstall the pan and add new ATF.
- Check fluid level and test drive.
A fluid change takes about 1 hour and can be done with basic tools.
How The Aw4 Affects Driving
The AW4 gives the XJ a smooth and comfortable ride. Here’s what you’ll notice:
- Easy acceleration: The car shifts gears without jerking.
- Low engine noise: Overdrive gear keeps RPMs down on the highway.
- Good for traffic: No need to shift gears in stop-and-go driving.
- Off-road control: You can use “2” or “1” to keep the car in a lower gear for hills or mud.
For beginners, the AW4 lets you focus on steering and braking, not shifting.
Fuel Economy And Performance
Many drivers ask if the AW4 helps with gas mileage. The answer is yes, but only if you drive smoothly.
- City driving: Around 15-16 mpg
- Highway driving: Up to 20-22 mpg
Using overdrive on the highway is key for better fuel economy. Heavy towing or aggressive driving will reduce MPG.
Upgrading Or Swapping The Aw4
Some XJ owners want more performance or have to replace a broken transmission. Here are common options:
- Rebuild the AW4: Good for original feel and reliability.
- Swap for a manual transmission: More work, but gives full control.
- Install a newer automatic: Rare, needs custom parts.
Most drivers stick with the AW4 because it fits well and parts are easy to find.
Non-obvious Insights For Beginners
- Transmission fluid temperature matters: Overheating can cause big problems. If you tow or drive in hot weather, consider adding a transmission cooler.
- AW4’s electronic controls: The AW4 has solenoids and sensors that talk to the car’s computer. If you have electrical problems (like bad wiring), it can affect how the transmission shifts—even if the mechanical parts are fine.
- Check engine light: Sometimes, transmission issues will set off the “Check Engine” light, not just the transmission warning light.
- Neutral safety switch: If your Jeep will not start in “Park” or “Neutral,” the problem may be the neutral safety switch on the transmission, not the engine.
Understanding these points can help you save money and avoid unnecessary repairs.
Aw4 Transmission Coding And Diagnostics
The AW4 has a set of codes for troubleshooting. A mechanic can read these with a scan tool. Some common codes:
- P0700: Transmission control system fault
- P0753: Shift solenoid A malfunction
- P0734: Gear 4 incorrect ratio
If your XJ shifts oddly, getting the codes checked is a smart first step.
Credit: www.guideautoweb.com
Finding Replacement Parts And Support
The AW4 was used in many Jeep XJs and some Toyota SUVs (like the Toyota Supra and Cressida in the 1980s). This means parts are easy to find in the US.
- Aftermarket parts: Filters, solenoids, and rebuild kits are widely available.
- Repair shops: Most mechanics know how to work on the AW4.
- Online forums: The Jeep XJ community has lots of guides and advice.
For more technical specs, you can check the Wikipedia entry on the AW4 transmission.
How To Tell If Your Aw4 Needs Service
Watch for these signs:
- Slipping: Engine revs but car does not speed up.
- Rough shifting: Hard jerks between gears.
- Delayed engagement: Slow to move when you shift from “Park” to “Drive.”
- Unusual noises: Whining, grinding, or clunking sounds.
If you notice these, check the fluid first. If the problem continues, visit a trusted mechanic.
Frequently Asked Questions
What Automatic Transmission Is In The 2000 Jeep Cherokee Xj?
The 2000 Jeep Cherokee XJ uses the Aisin-Warner AW4 automatic transmission. This is a four-speed, electronically controlled transmission that is very reliable and well-matched to the XJ’s 4.0L engine.
How Do I Check The Transmission Fluid In My Xj?
With the Jeep on a level surface and the engine running, shift through all gears, then leave the shifter in “Park. ” Pull out the transmission dipstick, wipe it clean, reinsert, and check the level. The fluid should be red and between the “Add” and “Full” marks.
What Are Common Aw4 Problems?
Common issues include delayed shifting, slipping gears, and fluid leaks. Most problems come from old or low fluid, worn internal parts, or faulty electronic solenoids.
How Long Does The Aw4 Transmission Last?
With regular maintenance, the AW4 can last over 200,000 miles. Changing the fluid and filter every 30,000 miles is important for a long life.
Can I Upgrade The Aw4 Transmission?
You can rebuild the AW4 with stronger parts or add a transmission cooler for better performance. Swapping to a different transmission is possible, but usually not worth the cost and effort for most drivers.
The AW4 automatic transmission is a big part of what makes the 2000 Jeep Cherokee XJ a great SUV. It combines durability, smooth operation, and easy maintenance. By understanding its basics, following simple care steps, and watching for signs of trouble, you can keep your XJ running strong for years. If you’re new to Jeep ownership, the AW4’s reputation for reliability should give you confidence every time you drive.
