2007.5 6.7L 6 speed manual, 3500. Cannot shift in R,2nd,4th or 6th gears. Shift lever will not go into any of these gears even with a lot of pressure. Gears 1,3 and 5 are fine. No unusual noises in transmission. Stopped at a stop sign and transmission would not go into second gear. Any ideas before I have to take to Dodge dealer?