Had the 02 Durango 4.7L ....in the shop yesterday....Problem was that the tranny wouldnt shift out of 3rd gear while cold....it would wind up driving the rpms up in the 2500 range..After a short time,usually under 5 minutes it would then shift normal....<br />Not sure how long this has been going on as I live a good 4 miles or so of stop and go city driving until I can get anywhere that I can drive 50+mph so normally with the stop and go traffic I wouldnt have to pay attention to when it shifted,by the time I got on the expressway it always shifted fine.<br />I recently was working out of town and the hotel was right next to the expressway,and thats when I noticed the shift problem, as it would still be cold when I got on the road.<br /><br /><br />Its under warranty<br />Mechanic tells me that after his test drive "cold" that the transmission is doing what it was designed to do..His exact words on the written report was <br />"It winds out normal operation of trans.Takes 2-5 miles before trans will go into lock-up,Checked for codes,no codes."<br /><br />So they are saying this is normal,But I have never had a problem with any of my other cars doing this..<br />I changed the tranny fluid as it needed changed,and it still drove the same way, so that had no influence at all...<br /><br />My question is are they feeding me a line of B.S. because the vehicle is still under warranty?<br /><br />What exactly is this "lock-up" he was talking about?