DGRALLYING

HI All

Is there any Mechanics here that know a lot about a 407 Mercedes Van??? (yeah i know i've posted this in the wrong place but can you leave it for a week as i really need as many people as poss to see this?

I have just bought a 407 and i want to change the diff so that i can get a better top speed as it is screaming it's guts out at 65 MPH.

Does anyone know if a minibus one is a better ration or is there a better one out of another van that will also fit???

Really look forward to someone helping me out on this one

Thanks All

Dean