transmission will not shift into overdrive
Hello great truck owners,
I have a 2000 2500 4x4 with cummins motor, automatic transmission. My truck has developed a shifting problem, it does not shift to overdrive and when put in drive to take off it takes off in 3rd gear. If you put it in low and shift it up as you drive it will shift 1st, 2nd,3rd but will not go into overdrive. I have changed the goverenor solinoid and goverenor switch , but it did not change anything. I took it to a repair shop and they put it on a computor, they said all of the connections were working and it is getting a signal to shift. I failed to get any codes from them so I am going to see if they will run it again and write any codes down. Any help from this forum will help.