Speed restriction/over rev limiter on 2002 Transit 350?

Hi
I have just bought a 350 lwb Transit and it has the over rev limiter on it. my question is can this be adjusted as it will on do 60/65 empty and dies a death when it looks at a hill. I'm not looking forward to doing it loaded! I'm not after the speed only the power when required ( or will the van perform the same loaded as unloaded?
Cheers