I have a 1967 convertible Bird with a completely rebuilt 326 bored .040 over with stock cam and a Holley 4 barrel. I also added a rebuilt TH350 trans in place of the original Powerglide. I am looking to change my rear end gearing to achieve a bit more torque. I need to know if my 2.56 ratio XB rear diff will accept a gear change to 3.23 ratio. Further, can I use this axle and housing and turn it from an open diff to a posi rear?
Any info regarding this change and suggestions about parts is greatly appreciated.