Hi I've got a series 2a Land Rover SWB diesel with a Mayflower PTO winch. I love the Landy which is sitting on a galvanised chassis but find it pretty slow on dual carriageways. I don't want to over rev the engine so max speed is about 50mph. I have an overdrive to fit but would lose the winch if I fit it. What are people's opinions overdrive or winch.