I have chased a hard shift going into 2nd gear on my 02 expedition for about 2 years. I went to multiple transmission shops and changed multiple engine sensors and parts. Only to continue to feel the truck surge into second gear. Finally after researching forums on the internet I found a guy who...
I'm having this same issue with my 2002 with the 4R100 trans. I have noticed it happens when shifting out of second which i think is around 30mph. Never throws a code or O/D flash.
Things I have done.
Tranny service from trans shop said it looked fine.
New spark plugs. Ouch that hurt...
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