Re: KS10 rear end
You can change the entire 3rd member with one with 4.10 gears. That is as high of a gear you are going to find, if you can find one. That is the highest gears ever made for those Eaton HO52/72's. New gears are not available. New drums are not available either.
I would suggest changing the entire differential for a 14 bolt with 3.73 or taller gears.
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