I put a 425 in my 1950 pontiac. It's almost a stock 425 but I know the tko600 will handle it. I have the stock rear end but I want to make it posi. I was looking in a old interchange manual and it says 1950-1957 pontiac and oldsmobile stuff will swap but doesn't specifically say if any of the third members are posi.I can't find any Detroit locker stuff for this rear end either. Does anyone have any experience with this older stuff
Look up "monzaz rear end" and contact him! Send him some pictures of what you bave and he will help you get the right parts.