All this work for almost nothing!

My kids and I drove to California to my aunt's memorial in the bay area the week before last and on the way down we noticed an intermittent harmonic vibration happening somewhere in the drivetrain. I couldn't pinpoint the were, so we stopped to check it out. the only thing that I saw was oil slinging from the pinion seal, so I thought that we were running low on lube, so I bought some lube to refill the lost oil, but it didn't take but a very small amount nothing to be concerned about, so we went along our way. the vibration was still there. well, we made to the bay area and back home. I estimate that we drove with the vibration happening about 800 + miles. when we got back home, I lifted the truck and heard the weird noise which I diagnosed as an axle bearing failing. long story short, replace both the bearings and nothing changed. I really struggled with this job, so my temper got high, and words were said so beware of a little profanity. &^%$*&#@!