Since you didn't give any info in your post I went to the bother of looking at your profile. I'm guessing you are looking to find info for an 86? If the question is what came from the factory then for an 86 it will be an AX5. You got the idea about the ba10/5 from Off-Road.com's Jeep Tech: Transmission page I bet.... it's wrong. If you woulda used the search you would have found my thread on this from a while back....
Mike B.