Repack bearings?

[jiimi62]

Ok, so in a few days I am going to attack replacing my passengerside cv shaft. I know on my explorer it was recommended that I repack my bearings whenever they are removed. I know that the s10 has a complete hub/bearing that doesn't really get taken apart and dismatled. I was at my local generic brand named auto parts store and saw they have a tool which basically sandwiches on either side of the bearing then using the grease gun forces the new grease inside. I was wondering if this would be worth doing, or would I be wasting my time. I figured since I would have it all apart why not get it if it may help or extend the life of my bearings.
THanks

89 s10 4x4 4.3L

[MT-2500]

If the sealed bearings are low on grease they are usually bad.