I did a tech tip here years ago on swapping the passenger torque tube rear end, which I did in my 46. But that was over thirty years ago and I'd avoid that now days as there are much better choices which are less work with better results and you get modern brakes. My 46 now runs a '65-'66 pickup rear end not to wide and lots of ratios swap in. I'm running 3:08s now which was super with the 4 speed but now with my T-5 I'd be better off with around a 3:50.
