Dear Converts, ? Were there really two different final drives made by the?factory for the Vanagon?? What is the ratio of the US '90/'91 Vanagon? ? If there was adaquate power available, I sure would like to see the engine turning around 3600 or 3700, instead of the 4000 it now turns at 70 MPH.? ? Nelson Stoll SF Bay Area '90 Vanagon ? ??? ?