Originally Posted by Freshmeat
I'm almost positive they were the same transmissions- AODs are AODs, but they also have AODEs and E4ODs, which were both electronically controlled, but they didn't issue them back in 1991, I don't believe. The AODs did have SLIGHT gearing differences, depending on the exact model, but I wouldn't know much about the vans off the top of my head.
I'm on my way out of the office, but I'll find a link for you later where you can look up the gear ratios according to the transmission code.
Thanks Freshmeat, I'd certainly appreciate it.
My uncle has the 91 that he was told, had previously been a Highway Patrol vehicle. The difference in ratios, however, when compared to my 86, does appear to be rather significant.