Have the following problem with my Berlingo BJ.2009,1,6 HDI with 80kw. My Berlingo is super-saving in the city and overland operation.Consums an average of 5.3l/100km.As soon as I drive the motorway the consumption goes up to over seven liters, although I do not drive faster than 130. At 130kmh I have 2950U/min on it.One notice clearly that the engine still has a lot of power and a sixth gear would be more than desirable. For Citroen you can find very few information about the technology. effend. Therefore my question: does someone know which six-speed gearbox, of course with a longer translation, fits my Berlingo? Or has someone ever swapped the gear pair for the 5th gear for a longer translated one? Original are a 50 teeth and 33 gear pair installed.Would I be very interested in how much U/min at 130kmh and a gear pair of 54 x 31 teeth would be concerned.Can you calculate that somehow?The work effort should only be about one hour,because the drive e does not have to be removed, but only the sheet cover has to be removed at the side.