2017 Transmission tuning

saltfarmer

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Mar 22, 2024
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Oklahoma
Hi I'm trying to get to the bottom of my intermittent harsh downshift issue. It occurs when coming to a stop somewhere between the 3-2-1 downshift. I feel a hard bang followed by a slight rev. I was initially told by my tuner that it must be my transmission so I replaced my transmission. I gave my friend my old transmission and he has put 30k problem free miles on it. I changed my tuning immediately after the reman transmission and have been still experiencing this issue. Trans builder tells me it's a known issue. Tuner never heard of it. Ford has a tsb for it. Stock tires. Stock everything except ez link. Stock engine tune. No matter what ez link transmission file I choose, I still have the issue. I perform the trans relearn on a up to temp transmission. I'm at a loss for ideas. I appreciate any help. Although this appears to be my first post, I was a member from the beginning. I just lost my login information after being off of here for a while.
 

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