The 63 rear end is narrower than 64. In 1964 a wider track was used with an exception. 64 Max Wedge utilized the rear of 1963 cars so wider tires could be installed. There is a tech memo issued describing this. You will find a 1965 rear is a different measurement from 1964 as well but without the issue previous years axles present. Rich 1964 Belvedere MW -- [Non-text portions of this message have been removed] ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.