Our first Sed Ak 400 (P reg) had the DB eight speed box and it never gave any problems apart from an airchange issue on the rangechange. I phoned the factory and spoke to the Technical Officer asking what the problem could be; his answer was “No idea, when you find out let us know” which helped a lot! The truck actually came new with a DB six speed but the eight speed was soon fitted presumably under warranty, why I know not unless the six speed gave poor performance at 30 tonne behind a 6LXB? The change wasn’t as good as the rest of the fleet with Fuller boxes though, you had to be absolutely spot on with your changes whereas you could ‘feel’ the Fuller in.
Pete.