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you're talkin about a difference of a quarter turn-I'd say do it if your case is shot and needs worked over, but if it ain't broke, why fix it. It's not a huge gain if you even notice the difference at all to spend the effort to swap em. If your buddy is trying to off it on you, take it check it out, rebuild it right away if it needs it, stick some plugs in the seals, fill it to the brim with gear oil and wrap it in plastic till the day yours goes south.