741 gears

742 gears will NOT fit into a 741 case -- i do not know of any bearing you could use to do this conversion let alone the dimensional differences in the pinion itself between the 742 and 741 cases -- yokes will interchange ,, i just went thru a very nice early 657 case ( same as 741 ) with an excellent 3.91 gear and open carrier that is going up for sale this week -- too bad shipping to the states is so expensive.