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You will have to go to an after-market housing such as a corporate 12-bolt GM or a Ford 9". After-market gears are non-existant for 1965-1970 Olds. The best u will find, if u r lucky, is a 3:08 posi. I am into the "big" Olds and I have looked for years for better gears, the best I have found is 3:08. I have several 3:08 Posi, most in my cars. Good luck, Ken
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