If you own or are thinking about buying a 1998 Jeep Cherokee, knowing which transmission it uses is very important. The transmission affects how your Jeep drives, how much gas it uses, and even how long it lasts.
Many buyers and Jeep fans want to know: what transmission is in a 1998 Jeep Cherokee, and what makes each one different? This guide will help you understand the options, their strengths, and what to look out for.
Transmission Options In The 1998 Jeep Cherokee
The 1998 Jeep Cherokee came with two main types of transmissions: manual and automatic. Each type was linked to certain engines and trim levels. Choosing between them affects how your Jeep feels on the road and how easy it is to drive.
Manual Transmission: Ax15
Most 1998 Jeep Cherokees with a manual gearbox used the AX15 transmission. This is a 5-speed manual transmission made by Aisin. Here are some key facts:
- Found in Cherokees with the 4.0L inline-six engine
- Known for smooth shifting and strong build quality
- Synchromesh design for easier gear changes
The AX15 is popular among Jeep enthusiasts because it is reliable and can handle some off-road abuse. The clutch is light and the gears are spaced well, making it good for daily driving and trail use.
Automatic Transmission: Aw4
If your 1998 Jeep Cherokee has an automatic, it is almost always the AW4. This is a 4-speed automatic made by Aisin-Warner. Main features:
- Used with the 4.0L six-cylinder engine
- Electronically controlled with a separate control module
- Has an overdrive gear for better fuel economy
The AW4 is famous for being tough and long-lasting. Many original units are still working after 200,000 miles or more. It shifts smoothly and is well-suited for both city and off-road driving.
How To Identify Your Transmission
You can find out which transmission your 1998 Cherokee has in a few ways:
- Look at the gear shifter. Manual transmissions have a stick you move through an H-pattern. Automatics have a PRNDL (Park, Reverse, Neutral, Drive, Low) pattern.
- Check the VIN sticker on the driver’s door or in the owner’s manual. The transmission code may be listed.
- Crawl under the Jeep and look for markings. The AX15 has a long, cast-aluminum case with “AX15” stamped on it. The AW4 is also aluminum but has a slightly different shape and a large wiring harness.
Comparison: Ax15 Vs Aw4
To help you compare the two main transmission types, here’s a quick side-by-side:
| Feature | AX15 (Manual) | AW4 (Automatic) |
|---|---|---|
| Speeds | 5 | 4 |
| Main Engine | 4.0L I6 | 4.0L I6 |
| Control | Driver (clutch pedal) | Electronic (no clutch) |
| Off-road Use | Very good | Excellent |
| Reliability | High | Very high |
Special Cases: 2.5l Engine And Rare Transmissions
Some 1998 Jeep Cherokees had the smaller 2.5L four-cylinder engine. These were much less common by 1998. They often came with the AX5 manual transmission, which is not as strong as the AX15. Automatics were not usually paired with the 2.5L engine in the US market.
Key Differences Between Ax15 And Ax5
| Feature | AX15 | AX5 |
|---|---|---|
| Strength | High (for 4.0L engine) | Lower (for 2.5L engine) |
| Gear Count | 5 | 5 |
| Common Problems | Minimal | Weak synchronizers, less durable |
If you have a 2.5L engine, the AX5 is fine for light use, but it is not the best for heavy towing or aggressive off-roading.
What To Watch Out For
When looking at a 1998 Jeep Cherokee, there are a few signs your transmission may need attention:
- Hard shifting in manuals or slipping gears in automatics
- Unusual noises when changing gears
- Leaking transmission fluid (reddish or brown under the Jeep)
- Check Engine Light related to transmission codes
It is smart to have a mechanic check the transmission if you notice any of these issues.
Practical Insights For Buyers And Owners
Many beginners think all Cherokees use the same transmission, but model, engine, and trim can make a big difference. Here are two tips even many owners miss:
- Transmission fluid matters: The AW4 requires a specific type of ATF (Dexron/Mercon). Using the wrong fluid can cause shifting problems or damage.
- Transfer case compatibility: If you plan to swap transmissions, make sure your transfer case matches. The AX15 and AW4 have different input lengths and spline counts.
Also, the AW4 can be controlled manually with simple wiring tricks, giving you more control off-road—a trick many advanced Jeep owners use.
If you want more technical details, visit the official Jeep Cherokee XJ Wikipedia page.
Frequently Asked Questions
What Transmission Fluid Does The Aw4 Use?
The AW4 automatic uses Dexron II or III ATF. Do not use Chrysler ATF+4 or other types, as it can cause damage.
Is The Ax15 A Good Transmission For Off-roading?
Yes, the AX15 manual is well-known for its strength and smooth shifts. It’s a favorite among off-roaders.
How Long Does An Aw4 Transmission Last?
With proper care, the AW4 often lasts over 200,000 miles. Regular fluid changes help extend its life.
Can I Swap An Aw4 For An Ax15 In My Cherokee?
It is possible, but it’s not a simple swap. You’ll need to change the transmission, driveshaft, pedals, and sometimes wiring.
How Do I Tell If My 1998 Cherokee Has The Aw4 Or Ax15?
Check if you have a clutch pedal (manual/AX15) or just a brake pedal (automatic/AW4). The shifter pattern will also tell you.
Knowing your 1998 Jeep Cherokee’s transmission helps you take better care of it and enjoy driving, whether on the road or the trail. Choose the right fluid, pay attention to warning signs, and you’ll get the best from your Jeep for years to come.
