[auburnf30x]

Just confirming...the error codes haven't come back since you went back to stock?

I would definitely change the fluid, though. Few threads around now on how beneficial it is. ZF apparently recommends it be changed right around your mileage, 50k miles/80k km.

First few gears shifting weird when cold is completely normal, just the way they operate apparently. Takes some getting used to. Shifts lag a bit and then do this weird 'lurching' shift once they do. Goes away once warm.