I have a 98 chevy Z-71 with a 4L60E transmission. The transmission is about4 years old bought brand new from dealership. My problem is it won't go into Overdrive or Drive from park reverse or neutral. When I take off I have to put it down in 1st or 2nd gear then put it up into drive or overdrive. All the other gears works good. It shifts good after you get it in drive or overdrive. Any thoughts.......