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i have a 1976 evinrude 70hp.3cyl, mod. 70673d ss# joo9723 . casting # inside exhaust port is 317903d1, 20" 4 spline drive shaft ,shift rod has curve on upper end . gear case 4"dia.( skag or lower fin is striaght not curved? dose it make any differance will any 4 spline 20" lower unit work?
