Here's how to approach identification:
1. Engine Identification: The engine type directly impacts the transmission type. Common engines in 1989 Comanches included:
* 2.5L I4: This typically used a manual transmission (AX-5) or a three-speed automatic (A999).
* 4.0L I6: This usually paired with a manual transmission (AX-15) or a four-speed automatic (AW-4).
2. Transmission Location & Visual Inspection:
* Locate the Transmission: The transmission is located behind the engine. You'll need to access it from underneath the vehicle.
* Look for Identification Tags: Check the transmission case itself for a stamped identification number or tag. This number will be the most definitive way to identify it. It might be small and faded, so a flashlight and a clean surface is helpful.
* Transmission Case Features: Look at the transmission's overall shape and size. While not foolproof, the number of shift linkages and the general configuration can offer clues. The AX-5 is relatively compact compared to the others.
* Shift Lever: If you're looking at the shift lever inside the cab, count the gear positions to get an initial idea (3 speed auto, 4 speed auto, or 5 speed manual).
3. Using the Vehicle Identification Number (VIN):
* Your VIN can be used to determine the original factory equipment, including the transmission. Contact a Jeep dealership or use a VIN decoder online (many are available, but verify their legitimacy). Be cautious, some sites may charge fees.
Possible Transmissions and their Characteristics (with caveats; always verify with your VIN):
* AX-5: 5-speed manual, commonly found with the 2.5L. Relatively small and compact.
* AX-15: 5-speed manual, more commonly paired with the 4.0L. Generally larger than the AX-5.
* A999: 3-speed automatic, usually associated with the 2.5L.
* AW-4: 4-speed automatic, more often found with the 4.0L. Generally larger and more complex than the A999.
Important Considerations:
* Previous Owners: The transmission might have been replaced at some point, so the original transmission may not be the one currently installed.
* Accuracy: Visual identification isn't always completely accurate. The VIN and any transmission identification tags are the most reliable methods.
If you can't definitively identify the transmission through visual inspection and VIN lookup, consider consulting a mechanic. They have the experience and tools to accurately determine the transmission type.
