Hi. I ahve an 01 ram, 1500 4x4. my auto transmission will not shift from 1st to 2nd unless i take my foot off the gas at about 35mph. Nothing seems to be slipping and as long as I stay about 35 it shifts normally....but around town on 30mph roads is another story. This started happening after I replaced the crank sensor. Any help would be awesome. Also, are there any vacuum lines that could be the issue? I have also replaced the TPS recently but that had no effect.