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4th gear in drive range won't engage
Aisin warner 0372L auto trans. been a problem from the moment i had the truck. engine originally is a g54b then replaced with a 4d56 turbodiesel when the gasser run out of blood throwing a rod on its block.
i had the impression that the aisin tranny is fully hydraulic/mechanical whatsoever and doesn't need electronics to do the shifting fulltime or part time. what could be the problem? does it require something like engine temp, trans temp, etc. to process the shifting? i really am not sure about it. i found the ECM a year ago on the passenger kick panel when i was doing some AC blower work on it. maybe the g54b used it (ECM) but the 4d56 didnt require one. the former owner did the swap fyi.
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