I’m working on the same swap right now in my ‘49. I have the third member out and I have cleaned the housing of the almost 70 years of sludge. Aside from replacing axle flanges and cover/differential gaskets, is there anything else I should do? I’m planning to stay away from replacing lots of parts on this.

My replacement is caked with grease and dirt around the yoke. I’m hoping it is not a bad seal. If it is, how difficult of a swap is it. And does the third member have to come out of the housing to do it?