Hi, I have a Crafter CR50 diesel and it is running at nigh on3000rpm when going 60mph. I figure it may have some low ratio box or diff. It is an ex police riot van and I am thinking of going around Europe. Could really do with some advice about whether I can change the diff to make it run a little more like 2-2,5K at 60. Does anyone know whether this is possible/feasible and if so know who can do it as there don't appear to be many people know anything about crafters, let alone CR50's. Your expert help would be most appreciated. Thanks in advance.