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Yes, spools and the spool bearings interchange. Just the pinions and their bearings are different along with yoke spline being either way (fine/course) on any of them..

You have to use the carrier bearings and races for the 489 carriers on the spool That makes it fit in all three cases, been there done that personnally on all three cases, 741,742 and the 489

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)