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AOD not shifting

It sounds like your tranny needs a rebuild to me. They didn't start putting E40D (electric AOD) trannies in until around 94 or so.

FYI.. the E4OD first appeared in trucks in 1989 pedating all other Ford auto overdrive transmissions except the all manual AOD. The E4OD is also related to the C6 trans and shares absolutely nothing with the AOD or it's decendants.. the AODE and 4R70W. Also note that the term "AOD" referrs to an actual Ford transmission here and is not meant to be a generic reference to automatic transmissions equipped with an overdrive gear.
 
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