AOD from '83 Grand Marquis

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I was told by a transmission shop to look for a hex indent in the top. These include stronger parts. I don't think they started 'til the late '80's though. Mine came from an '89 Cougar. If I was to do it all over I would have put in a 5 speed manual or go the extra with the Hi$ interface module and install an AOD-E. I don't like the shift characteristics/pattern of the AOD other than Full throttle.