Our 10hp doesn't run out of power.It will spin before that.We only run 1st or 2nd and there stock gears and the motor only has the head shaved.And we haven't broke an axle or carrier but i'm putting a built 14hp in in the off season.And i'm putting a fine spline rear in and a hardened top shaft and all the good stuff because sooner or later it will break. 
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Current tractor my son and i have
1991 wheelhorse 520h 60"deck 48"snow blower w/ onan 20 hp
1980 whelhorse b-82 need restore
1976 simplicity 7116 all restored waiting for a new motor (my sons tractor)
1967 sears super 12 (my sons tractor)
1972 Cub cadet 108 restored w/ complete motor rebuild 5 years ago
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