My Explorer 2000 EB has 5R55E automatic transmission. I have about 140K miles on the vehicle.
For the last few weeks I have noticed that the transmission does NOT shift smoothly when shifting up out of 2 nd gear, it usually happens when starting after the vehicle is un-used for 6 hours or so, once the vehicle is on the road for 20 minutes or so, this problem goes away.
The fluid and filter were changed about 18 months ago as a matter of maintenance (no issues). About one year ago I had the same problem develop suddenly and for the first time, I added a container of trans fluid conditioner and it went away. The vehicle is well maintained and there are no other issues. I do not want to keep adding conditioners without having some understanding as to what am I dealing with.
Please advise.
Thanks
Matt