5R55S slow engagement after fluid and filter service | Page 2 | Ford Explorer Forums - Serious Explorations

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5R55S slow engagement after fluid and filter service

I just flushed and replaced the filter my 2008 Explorer (95k miles), same 5r55s transmission with MaxLife Multi-Vehicle ATF. I noticed right away that the reverse gear was clunking into engagement. I did some research and found that the 5r55s has optimal shifting memory that you need to clear out. Basically disconnect the battery, connect the positive to negative for 5+ min. After I cleared the memory and drove 10+ miles, the transmission shifts buttery smooth in all gears. Also agree you need to make sure the fill level is correct, which is hard to do with these stupid sealed transmissions. May not solve your situation but it's worth a try.

Here a vid on clearing the memory:
 






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