Ive had a problem with harsh down shifting (clunk from 2nd to 1st mostly) my 09 expedition since I bought it a year ago . I’m wondering if there is there a bad ground somewhere causing the harsh downshift ? If so where do I start looking ? I also occasionally get the wrench light and it gets stuck in 1st gear as well as delayed engaging into gear . Sometimes I gotta give it gas and it slams into gear .