Description
Reliable Performance: Jeep AW4 Transmission for Sale
Got a Jeep Cherokee XJ standing by? Or looking to upgrade one? Take a look at this Jeep AW4 transmission for sale here at Vaz Auto Solutions. Another one of the great products engineered as a result of the Jeep / Aisin-Warner partnership, the AW4 transmission is designed to perform across on-road comforts and off-road adventures. The transmission is extremely reliable with great performance and even better durability , this is the reason why the AW4 transmission for sale here is a favorite among Cherokee XJ enthusiasts.
So if it’s an old transmission you want to replace or you’re looking to make your Jeep even better, this used AW4 transmission for sale here, with its smooth delivery, will get the job done.
What is the AW4 Transmission?
The AW4 transmission first came into the world in 1987 with the Jeep Cherokee XJ, the vehicle it was largely designed for. This 4-speed electronic automatic transmission received praise for its smooth delivery and adaptability across various driving conditions. The Jeep AW4 transmission for sale here is a great buy for those who use their Cherokees for towing, since the transmission can handle increased torque loads and the electronic system helps adjust shift patterns based on driving terrain. The AW4 is compatible with both the 2.5L AMC inline-4 (early years and low-trim applications) and the legendary 4.0L AMC inline-6 (the dominant XJ engine combination).
Aisin-Warner AW4: The Toyota Connection
The Aisin-Warner AW4 isn’t just a Jeep transmission , it’s part of the broader Aisin A340 family used extensively by Toyota in some of the most reliable Japanese vehicles ever made:
| Aisin Family Member | Used In | Notes |
|---|---|---|
| AW4 (THIS LISTING) | Jeep Cherokee XJ, Comanche MJ, Wagoneer | The Jeep variant |
| A340 / A340E | Toyota Supra MK3, Toyota 4Runner, Toyota Pickup | The Toyota equivalent |
| A341E | Toyota Cressida, Lexus LS400 (early), Toyota Soarer | Slightly stronger variant |
| A343F | Toyota 4Runner, Toyota Land Cruiser (some) | 4WD-oriented variant |
This shared Aisin family heritage is one reason for the AW4’s legendary reliability , Aisin’s design and manufacturing standards transferred directly to the Jeep application.
Why “The AW4 Lasts Forever“
The Jeep AW4 has earned a reputation in Cherokee XJ circles for exceptional durability. Common reasons for the AW4’s longevity:
- Conservative shift programming: The TCM is programmed for smooth, gentle shifts that minimize wear
- Strong internal components: Aisin engineering with quality clutch packs, planetary gears, and bearings
- Adequate torque capacity: ~300-350 lb-ft handles the 4.0L AMC inline-6 (235 lb-ft) with significant margin
- Robust valve body: Hydraulic control system holds up to high mileage
- Excellent torque converter: The AW4 torque converter is well-matched to the 4.0L’s torque curve
- Service-friendly design: Easy to drop the pan, change filter and fluid
Many Cherokee XJ owners report AW4 transmissions exceeding 300,000 miles with regular fluid and filter changes. Some report 400,000+ miles on original AW4s. This is exceptional for any automatic transmission, particularly a 1980s-design unit.
Vehicle Applications
The Jeep AW4 transmission was used in:
| Vehicle | Years | Engine Pairings | Notes |
|---|---|---|---|
| Jeep Cherokee XJ (THIS) | 1987-2001 | 4.0L inline-6 or 2.5L inline-4 | The dominant XJ automatic, available alongside the AX-15 5-speed manual |
| Jeep Comanche MJ (THIS) | 1988-1992 | 4.0L inline-6 or 2.5L inline-4 | The XJ-based pickup truck |
| Jeep Wagoneer (Limited 4-door SJ) | 1987-1990 | 4.0L inline-6 | Limited applications in the older full-size Wagoneer |
Key Engineering Features of the AW4
- 4-Speed Automatic with Overdrive: Gears 1st (2.804:1), 2nd (1.531:1), 3rd (1.00:1 direct), 4th (0.753:1 overdrive), Reverse (2.393:1)
- Electronic Control: TCM (Transmission Control Module) electronically manages shift points , one of the first electronic automatic transmissions in mass-market production
- Torque Converter Lockup: Reduces slippage and heat at highway speeds, improves fuel economy in 4th gear
- Cast Aluminum Case: Lighter than cast iron, adequate strength for application
- Electronic Shift Solenoids: Precise, repeatable shifting controlled electronically
- External Cooling: Factory transmission cooler, auxiliary cooler recommended for heavy towing
- Modular Valve Body: Service-friendly design for valve body service or replacement
Common AW4 Service Items (Honest Disclosure)
Honest disclosure of known service items:
- Torque Converter Clutch (Lockup) Failure: Most common high-mileage failure (150,000+ miles). Symptoms: shudder during lockup engagement, slipping in 4th gear under light load.
- Valve Body Wear: Common at 200,000+ miles. Symptoms: harsh shifts, delayed engagement, slipping.
- Shift Solenoid Failure: Electronic solenoids can fail over time. Symptoms: stuck in gear, harsh shifts, no shift.
- Speed Sensor Failure: Both input and output speed sensors can fail at high mileage, affecting shift quality.
- TCM (Transmission Control Module) Failure: Less common but possible at very high mileage.
- Pan Gasket Leaks: Pan gasket should be replaced during fluid services.
- Output Shaft Seal: Can develop slow leaks at high mileage.
The AW4 is generally durable when maintained per Jeep specifications. Service interval: fluid and filter every 30,000-50,000 miles. Many AW4s benefit from full fluid flushes at higher mileages to extend life.
Why Choose a Used Jeep AW4 Transmission?
- Cost savings vs reman ($609 used vs $1,400-$2,500 reman plus core)
- Direct OEM fit for Cherokee XJ 1987-2001, Comanche MJ 1988-1992
- Legendary reliability , one of the most respected automatics in Jeep history
- Strong torque capacity , adequate for 4.0L inline-6 with significant margin
- Aisin quality , shared family with Toyota A340 transmissions
- Service-friendly , easy fluid and filter access
Here at Vaz Auto Solutions, you’ll find this Jeep AW4 transmission for sale at the most reasonable price possible, with all 4 forward gears tested including overdrive lockup, torque converter operation verified, electronic shift solenoids tested, and donor vehicle documented.
Vehicle Compatibility
Direct Fit:
| Jeep Cherokee XJ | 1987-2001 with 4.0L AMC inline-6 or 2.5L AMC inline-4 (most common AW4 application) |
|---|---|
| Jeep Comanche MJ | 1988-1992 with 4.0L AMC inline-6 or 2.5L AMC inline-4 (the XJ-based pickup) |
| Jeep Wagoneer | 1987-1990 limited applications with 4.0L inline-6 |
Engine Pairing:
| Jeep 4.0L AMC Inline-6 (242 cid) | The dominant AW4 pairing, 190 HP / 235 lb-ft in later years |
|---|---|
| Jeep 2.5L AMC Inline-4 (150 cid) | Lower-trim XJ applications, particularly early Cherokee XJ |
Condition and Inspection
- Donor vehicle confirmed (Cherokee XJ, Comanche MJ, or Wagoneer)
- Engine pairing confirmed (4.0L AMC inline-6 or 2.5L inline-4)
- 2WD vs 4WD output configuration verified
- All 4 forward gears tested
- Overdrive (4th gear) lockup function tested
- Reverse gear tested
- Torque converter operation verified
- Torque converter clutch (lockup) function tested
- Electronic shift solenoid function tested
- Valve body function assessed
- Line pressure verified at idle and operating speeds
- Speed sensor function checked (input and output)
- TCM compatibility verified for application year
- Pan dropped and inspected for excessive debris
- ATF condition documented (color and smell)
- Bell housing condition inspected
- Output shaft seal condition assessed
- Miles from donor vehicle documented where available
- All 4 gears + reverse tested on every AW4
- Overdrive lockup function verified (critical AW4 service item)
- Torque converter operation confirmed
- Electronic shift solenoids tested
- Engine matching verified (4.0L inline-6 vs 2.5L inline-4 bell housing)
- 2WD/4WD output configuration matched
- Donor vehicle and mileage documented
- Cross-reference assistance for Cherokee XJ, Comanche MJ, Wagoneer applications
- Free freight pallet delivery to all 50 states
- 15 day replacement warranty on internal defects
- Jeep AW4 specialist support team (Cherokee XJ expertise)
Eric Harris (verified owner) –
Just put the Jeep AW4 transmission from Vaz Auto Solutions into my Jeep, and it’s performing well. The shifts are consistent, and the driving experience is solid. It does the job and meets expectations. Good service and delivery, too.
Brian Mitchell (verified owner) –
The Jeep AW4 transmission from Vaz Auto Solutions is a game changer! It delivers exceptionally smooth shifting and responsive performance. My Jeep feels more powerful and reliable. Excellent product overall—highly recommended!