Hey all, got a 2005 8010 with groundspeed problems, gears 1-2-3 are good but 4th is dead. Any ideas. I've had some weird things with the ground speed, for a while all we had top speed issues in each gear, had to combine in 3rd just to get 6mph and we could go 13mph in reverse. I found a main ground under the cab that was loose that helped a lot of the problems and after recalibartain everything I cant get 4th to go, valve problem maybe? Thanks!