741 sg 489 open 8 3/4

i was wanting to no can this be done i was going to pull the suregrip unit out of the 741 case and pull the open out of the 489 case and use the gear set from the 489 on the suregrip and put it back together in the 489 case and was wanting to no will it work and do i need to use the carier bearings from the 489 are will the carier bearings from the 741 work in the 489