8.75 question - what gives???

Oldkimmer is right , do not repace them just because you can move it, straight roller bearings are like that , i would just put new seals in the housing , putter back together , set you end play adjustment , make sure you have a pointer to lock the nut , way you go .Oh do not forget your 80w90 , and additive. I had a s t load of 83/4s over the last 30 years and never changed an axle bearing.