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  1. I wanted to put 3:92 gears in my 50 mercury.The 3:92 comes from 3speed with no O|D.That means finding a good rear end.You would b lucky to find one.The ring n pinion are no longer made.51 merc rear is different .So u need a good 49 merc rear with good ring n pinion, good luck.So I have to stay with a 4:27 50 rear with O|D.I live were it’s flat every ware n 60 miles an hour,my engine could handle that.Any comments would b appreciated.