Your quad might wobbel a little or some play in the axel. You'll be able too tell... your turinig will prolly not be as tight as well. Prop the back end up off the ground on the swingarm plate and grab the axel and wiggle it real hard and itf theres alot of movement id change em
If you do end up replacing your axle bearings I would go ahead and replace the swing-arm bearings at the same time; it will make life much more easy in the long run with the axle out.