1994 dodge caravan 3.0 6 I just had the trans. rebuilt. What speed should it shift from 1st. to 2nd. and 2nd. to 3rd. ? It is shifting at 20 mph from 1st. and 30 mph from 2nd. the shifts are hard. I am used to it shiftimg at lower speeds and smoother. Is it a quick easy fix for the repair shop that did the re-build?