What Tautomatic Ransmission Is In A Jeep Cherokee Xj 2000

Identifying the specific automatic transmission in a 2000 Cherokee XJ requires checking the vehicle’s build sheet or transmission pan shape. The question of what tautomatic ransmission is in a jeep cherokee xj 2000 is common among owners and enthusiasts, as the XJ came with a few different options depending on the engine and production date. Understanding this can save you time and money when ordering parts or planning repairs.

Most 2000 Jeep Cherokee XJs came with either a 4.0L inline-six engine or a 2.5L four-cylinder engine. The transmission type varies by engine. For the 4.0L, the standard automatic was the AW4, built by Aisin Warner. For the 2.5L, the automatic was the 30RH (also known as the TorqueFlite 904). Let’s break down exactly what you need to look for.

The automatic transmission in your 2000 XJ is almost certainly one of two units. The most common is the Aisin Warner AW4, found behind the 4.0L engine. The other is the Chrysler 30RH, used with the 2.5L engine. There is also a rare possibility of the 42RE, but that is less common for this year. The easiest way to confirm is by checking the transmission pan shape.

How To Identify Your Transmission By Pan Shape

You can identify the transmission without crawling under the vehicle if you know what to look for. The pan shape is the quickest method.

AW4 Pan: This pan is rectangular with a slight curve on one side. It has a distinct step or offset on the driver’s side. The pan gasket is a simple rectangular shape with a notch.
30RH Pan: This pan is more square-shaped with rounded corners. It is flatter overall and does not have the offset step of the AW4.
42RE Pan: This pan is similar to the 30RH but slightly larger. It has a more pronounced lip around the edge.

If you see a pan that looks like a rectangle with a cutout, it is the AW4. If it looks like a square with rounded corners, it is the 30RH or 42RE. Check your build sheet if you have it. The build sheet lists the transmission code. For the 2000 XJ, the code for the AW4 is usually “DGP” or “DGQ”. For the 30RH, it is “DGA”.

Transmission Fluid Type And Capacity

Using the correct fluid is critical for transmission health. The AW4 requires Dexron III or Mercon V automatic transmission fluid. Do not use Chrysler ATF+4 in the AW4. The 30RH uses Chrysler ATF+3 or ATF+4. The 42RE also uses ATF+4. Mixing fluids can cause shifting issues or damage.

AW4 Fluid Capacity: Approximately 8.5 quarts for a dry fill. A simple drain and refill uses about 4 quarts.
30RH Fluid Capacity: Approximately 8.0 quarts for a dry fill. A drain and refill uses about 3.5 quarts.
42RE Fluid Capacity: Approximately 9.0 quarts for a dry fill. A drain and refill uses about 4.5 quarts.

Always check the fluid level with the engine running and the transmission in park on a level surface. Use the dipstick to verify. Overfilling can cause foaming and poor shifting.

Common Issues With The AW4 In The 2000 XJ

The AW4 is known for being robust, but it has some common issues in the 2000 model year. The most frequent problem is the transmission control module (TCM) failing. This can cause erratic shifting or no shifting at all. Another issue is the torque converter clutch (TCC) solenoid failing, leading to shuddering at highway speeds.

TCM Failure: Symptoms include no reverse, harsh shifts, or the transmission staying in one gear. The TCM is located under the dashboard on the passenger side.
TCC Solenoid Failure: You may feel a vibration or shudder when the torque converter locks up. This is often accompanied by a check engine light.
Shift Flare: A momentary increase in RPM between gears. This can be caused by low fluid, a worn valve body, or a failing solenoid.

Regular fluid changes every 30,000 to 50,000 miles help prevent these issues. Use a quality filter and gasket when servicing the transmission.

Common Issues With The 30RH In The 2000 XJ

The 30RH is a simpler, three-speed transmission. It is generally reliable but has its own set of problems. The most common issue is a worn kickdown cable. This cable controls shift points and line pressure. If it is out of adjustment or stretched, shifts become harsh or delayed.

Kickdown Cable Issues: A loose cable causes late shifts. A tight cable causes early shifts. Adjust it by pulling the cable at the throttle body.
Fluid Leaks: The 30RH is prone to leaks from the front pump seal or the pan gasket. Check the fluid level regularly.
Band Adjustment: The front band may need adjustment over time. This requires a special tool and is best done by a mechanic.

The 30RH does not have a replaceable filter. It has a screen that is cleaned during service. Use only the correct fluid type to avoid damage.

How To Check The Transmission Fluid Level

Checking the fluid level is simple but must be done correctly. Follow these steps for an accurate reading.

Park the vehicle on a level surface.
Start the engine and let it idle. The transmission fluid must be warm.
Move the shifter through all gears, pausing in each for a few seconds. Return to Park.
With the engine still running, pull out the dipstick. Wipe it clean with a lint-free cloth.
Insert the dipstick fully, then pull it out again. Check the fluid level.
The fluid should be between the “Cold” and “Hot” marks. For a warm engine, it should be near the “Hot” mark.
If low, add fluid slowly through the dipstick tube. Do not overfill.

If the fluid smells burnt or looks dark brown, it needs to be changed. Milky or frothy fluid indicates coolant contamination, which is a serious problem.

Transmission Identification By VIN Number

You can also identify the transmission by the vehicle identification number (VIN). The VIN is located on the dashboard near the windshield and on the driver’s door jamb. The 8th character of the VIN indicates the engine type. The transmission is not directly encoded in the VIN for the 2000 XJ, but you can cross-reference the engine.

VIN 8th Character “S”: This indicates the 4.0L engine. The automatic transmission is almost always the AW4.
VIN 8th Character “P”: This indicates the 2.5L engine. The automatic transmission is the 30RH.

If you have a 4.0L, you have the AW4. If you have a 2.5L, you have the 30RH. This is the most reliable method without crawling under the vehicle.

Transmission Cooler Lines And Cooling

Both transmissions use cooler lines that run to the radiator. The radiator has a built-in transmission cooler. In the 2000 XJ, the cooler lines are metal tubes with rubber hoses at the connections. Leaks at these connections are common. Check for fluid drips near the radiator.

If you tow or drive in hot conditions, consider adding an external transmission cooler. This helps keep fluid temperatures down and extends transmission life. The AW4 is more sensitive to heat than the 30RH. A cooler is a good investment for any XJ.

Transmission Rebuild Or Replacement Options

If your transmission fails, you have several options. Rebuilding the AW4 is common and cost-effective. Parts are widely available. The 30RH is also rebuildable but parts may be harder to find. A used transmission from a salvage yard is another option. Ensure it comes from the same engine type.

Rebuild Kit: Costs between $200 and $400 for the AW4. Labor adds $800 to $1,500.
Used Transmission: Costs between $300 and $800. Check the mileage and condition.
Remanufactured Unit: Costs between $1,500 and $2,500. Comes with a warranty.

For the 2000 XJ, the AW4 is more common and easier to find. The 30RH is less common but still available. Always verify the transmission code before purchasing a replacement.

Shift Pattern And Gear Ratios

The AW4 is a four-speed automatic with overdrive. The gear ratios are 2.80:1 in first, 1.53:1 in second, 1.00:1 in third, and 0.75:1 in fourth. The 30RH is a three-speed without overdrive. Its ratios are 2.74:1 in first, 1.54:1 in second, and 1.00:1 in third. The 42RE is a four-speed with overdrive, but it is rare in the 2000 XJ.

The AW4 provides better highway fuel economy due to the overdrive gear. The 30RH is simpler and more robust for off-road use but lacks the overdrive. If you drive on the highway frequently, the AW4 is preferable.

Transmission Control Module (TCM) Location And Function

The TCM controls shift points and torque converter lockup. In the 2000 XJ, the TCM is located under the dashboard on the passenger side. It is a small black box with a wiring harness. If the TCM fails, you may experience no shifting or erratic behavior. The TCM can be rebuilt or replaced with a used unit.

Some owners upgrade to a manual TCM for firmer shifts or better control. This is a popular modification for off-road use. The stock TCM is fine for daily driving.

Torque Converter Specifications

The torque converter in the AW4 has a stall speed of approximately 1,800 to 2,000 RPM. The 30RH has a stall speed of around 1,600 to 1,800 RPM. The torque converter locks up in third and fourth gear in the AW4. In the 30RH, the torque converter locks up in third gear only.

A failing torque converter can cause shuddering or vibration. If you feel a shake at highway speeds, the torque converter clutch may be failing. This is a common issue with the AW4.

Transmission Service Intervals

Regular service is key to transmission longevity. For the AW4, change the fluid and filter every 30,000 miles under normal driving. For severe driving (towing, off-road), change it every 20,000 miles. The 30RH should have the fluid changed every 30,000 miles. The screen should be cleaned at the same time.

Use only the recommended fluid type. For the AW4, use Dexron III or Mercon V. For the 30RH, use ATF+3 or ATF+4. Never mix fluids. A simple drain and refill is sufficient for maintenance. A full flush is not necessary and can sometimes cause issues.

Common Symptoms Of Transmission Problems

Knowing the symptoms of transmission problems can help you catch issues early. Here are common signs to watch for.

Slipping: Engine RPM increases without a corresponding increase in speed. This indicates worn clutches or low fluid.
Harsh Shifting: Abrupt or jerky shifts. This can be caused by low fluid, a bad solenoid, or a worn valve body.
Delayed Engagement: A pause before the transmission engages when shifting from Park to Drive or Reverse. This is often a sign of low fluid or a worn pump.
No Reverse: The vehicle moves forward but not in reverse. This is a serious issue, often requiring a rebuild.
Burning Smell: A burnt odor from the transmission indicates overheated fluid. This requires immediate attention.

If you notice any of these symptoms, check the fluid level first. If the fluid is low, top it off and see if the issue resolves. If the fluid is burnt or dark, a service is needed.

Upgrading The Transmission For Off-Road Use

If you use your XJ for off-roading, consider upgrading the transmission. The AW4 can be strengthened with a shift kit, a larger cooler, and a deeper pan. The 30RH is simpler and can be improved with a manual valve body and a cooler. Both transmissions benefit from synthetic fluid.

A shift kit provides firmer shifts and reduces heat buildup. A larger cooler helps maintain safe fluid temperatures. A deeper pan increases fluid capacity and helps cooling. These upgrades are relatively inexpensive and can extend transmission life significantly.

Transmission Compatibility With Different Engines

The AW4 is designed for the 4.0L engine. The 30RH is designed for the 2.5L engine. They are not interchangeable without significant modification. The bellhousing patterns are different. The torque converters are also different. If you swap engines, you must use the correct transmission for the engine.

Some owners swap a 4.0L into a 2.5L XJ. In this case, you need the AW4 transmission from the donor vehicle. The wiring and TCM must also be swapped. This is a complex project but doable with the right parts.

Transmission Dipstick Location And Reading

The dipstick for the AW4 is located on the passenger side of the engine bay, near the firewall. It has a yellow or orange handle. The dipstick for the 30RH is on the driver’s side, near the back of the engine. It has a red or orange handle. Always check the fluid with the engine running and warm.

The dipstick has two sets of marks: one for cold fluid and one for hot fluid. Use the hot marks for an accurate reading after driving. If the fluid is cold, use the cold marks as a rough guide. Do not rely on the cold reading for accuracy.

Transmission Filter Replacement

The AW4 has a replaceable filter that is changed during a fluid service. The filter is located inside the pan. Remove the pan, replace the filter, and install a new gasket. The 30RH does not have a replaceable filter. It has a screen that can be cleaned. The screen is located in the pan and can be rinsed with solvent.

Always use a new gasket when reinstalling the pan. Torque the pan bolts to the manufacturer’s specification. Over-tightening can warp the pan and cause leaks.

Transmission Temperature Monitoring

Monitoring transmission temperature is important for longevity. The ideal operating temperature is between 160°F and 200°F. Temperatures above 220°F cause fluid degradation. Above 240°F, damage occurs quickly. If you tow or off-road, consider installing a transmission temperature gauge.

An external cooler helps keep temperatures down. The cooler should be mounted in front of the radiator for maximum airflow. Use a cooler with a fan for extreme conditions.

Frequently Asked Questions

What Is The Most Common Transmission In A 2000 Jeep Cherokee XJ?

The most common automatic transmission is the Aisin Warner AW4, found behind the 4.0L engine. It is a four-speed with overdrive.

Can I Use ATF+4 In My 2000 XJ Transmission?

Only if you have the 30RH or 42RE transmission. The AW4 requires Dexron III or Mercon V. Using the wrong fluid can cause damage.

How Do I Know If My 2000 XJ Has The AW4 Or 30RH?

Check the transmission pan shape. The AW4 pan is rectangular with a step. The 30RH pan is square with rounded corners. Also, check the engine size: 4.0L uses AW4, 2.5L uses 30RH.

Is The AW4 A Good Transmission?

Yes, the AW4 is known for being robust and reliable. It is used in many Jeep models and is easy to maintain. Regular fluid changes are key to its longevity.

What Causes The AW4 To Shift Hard?

Common causes include low fluid, a bad TCM, a faulty solenoid, or a worn valve body. Check the fluid level first. If the fluid is good, the TCM or solenoids may need attention.