Mate, Congrts on the impending nuptials!!! I would go a different way I am afraid... It is not ideal and may not be popular!! I wouldn't do anything to the car..... Take the auto enjoy the trip and spend the money else where.... It's your honeymoon!!! Failing that you need to look and spend the right money and get a car to the spec you want etc.. The car failing after either you've done work or the issue it would cause on the first trip of your marriage will haunt you forever if you get it wrong... PS there is more to the change than you first think. What warranty etc on the gearb