Noticed bad grinding noise in drive today. Been steadily getting worse as been run. It was faint last year and worse now. I did put new grease in shaft a month ago and followed mud buddy steps in doing this. I'm just wondering if I put too much grease and blew some seals and that is why grinding worse now. If I need to replace seals is there any other parts in drive I need to replace with it, or is this a worse issue than I think, like possibly new drive shaft assembly?

More then likely sounds like your bearings