I was given a 1977 300D and love it. It was babyed since it was new and my grandparents were the orig. owners. Its a automatic and im in my teen years so im looking into converting it into a manual. I have heard stories about this automatic 617 having a different crank then the manual. I am wondering if this is true and if not what would be a good transmission that would fit this car (with a modified driveshaft of course).