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I cant believe I can't get a more clearer answer on this.
we always use whatever we can get and have not had problems.i do know some have a smalll and others have large bearings that never seemed to make a difference in my case.also we buy a cheaper ring and pinion gear so if it does mess up your not out a bunch of money.i have ran a ump modified for the past 10 years and had good luck like this. good luck fred.