* Case Length: The AX-15 is noticeably *longer* than the AX-5. This is the easiest visual distinction. If you can see both transmissions side-by-side, the difference will be apparent.
* Shift Pattern: While not directly visible without opening the transmission case, the shift patterns are different. The AX-5 typically has a more "H" pattern, whereas the AX-15 is often described as having a more "laid-back" or less upright "H" pattern. This isn't always reliable for identification without a clear visual of the shift pattern.
* Top Cover: The top cover (the part you see when the transmission is installed in the Jeep) will have different casting numbers. You'd need to either consult a parts manual or a database of casting numbers to definitively identify the transmission based on this. This is less convenient for quick identification.
* Input Shaft: The input shaft length is different. This requires removing the transmission and measuring the shaft, making it a less practical method for simple identification.
In short: The length of the transmission case is the most reliable and easiest way to tell the difference between an AX-5 and an AX-15 in a Jeep YJ without specialized tools or knowledge. If one is significantly longer than the other, it's the AX-15.
