I have a 95 bronco with a e4od trans ,it had a harsh shift in 3rd and reverse. a trans shop looked at it and said a acculimator spring was broke so he replaced it and it shifted great for about 20 miles then it quit shifting into 3rd and reverse completly .I put it in reverse and gunned engine and it shifted ,but now it has the harsh shift again. Does any one have any ideas what the problem could be?