1965 7/8 lower shaft Muncie main case dated 0607 , excellent used condition , no stripped treads [ 2 retainer threads freshly heli-coiled] Tight countershaft bore both front and rear, accurately measured, Most factory 7/8s counter shafts measure between .8735 -.8740 ,they are not exactly 7/8 , this case still has a lot of press fit in the front, this is where most of the units leak from