Originally Posted by
Great Southern Camping
When you start the truck, the switch in the centre console for "Auto, Hold, Power" will flash. Count the flashes and sometimes it may be a known TCU fault code (I had 16 flashes prior to box overhaul as have a couple of other people, and whilst I thought this was normal, it isn't - it was flashing an error code; it is now fixed, TC replaced and only flashes about 4 or 5 times and is running like a bought one).
Other than that, the 4th gear is overdrive, and I believe there is a switch for that (not the lever switch) below the stick in the cover, or on top of the box with the ATP switch. That would be a good place to start also maybe?
Odd about the first gear issue though - like it hasn't got enough oil flow/pressure when cold which could suggest incorrect oil type as stated already - what oil do you run? Fully synthetic?
Scotty (Bigrig)