ford 8" trac lok locker and truetrac bearings

when converting a standard open / non posi ford 8" rear differential over to a trac lok / clutch style posi , or a detroit locker / detroit truetrac , you will need different bearings for any tractiomn style differential the part #s for these bearings are LM102949 , x 2 will be needed , and the bearing races are LM102910 x 2 will be needed , most catalogs do not reference this change in bearings , we stock both of these bearing #s in Timken brand