Chris, If you have a 65 and up rear end, you will not. You will need buttons for the center of the pig if your going to use the stock Timken bearings. If your going to run Green bearings you will not need the buttons. If your rear end is 64 and back, you will need the correct axles and buttons. Timken bearings are great, but I do prefer the Moser Green bearings. I have had great luck with them, some people have not. The Green bearings make life easy. You can run a pre 65 posi in a 65 and newer housing. Earl Will I need different axles to replace the Open rear in my '64 to a Sure-grip? Stock 8 3/4 rearend. Thanks, chris alabama ---- 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.