Good info, but it does not apply to the Aisin-warner tranny. I have seen people state in this forum and on others that they have an A-500 mopar tranny in their truck, but I highly doubt it, as these trucks were built for Chrysler by mitsubishi and it would have required mopar to make a special tranny for them. Even the baby 904 in your 86 was not built by mopar, the design was theirs but was built by someone else, probably aisin.