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Re: 4R100 Transmission rebuild time?
Posted to Transmission Forum on 9/17/2018

Sounds to me like you have a intermediate diode locked up. I think this was the year ford tried them in the 4r100. They had high failure. When the trans goes to 3rd the intermediate clutch says on and the diode is suppose to go the freewheel. I think yours is ... Login to read more.