Need help on my Silverado.. Grinding.. Whirring sound up front in 4WD

KZ- Amen to that brother! I'm bleeding out $ right now. In the past Month I'm at this point:
The Hallway tear-out at Home (I minimize expense.. cause that's what I do.. so I can do it pretty cheap and still look good- but materials are materials!)
Client basically in a nutshell told me my pulling cars was putting his project behind schedule (One was HIS) so I've been hauling overtime there
My wife's Alternator and Battery had to be replaced ($325)
Now My differential goes out- Lost a days pay today going to get it, going to mechanic so he can drain and refill tonight before install tomorrow ($550)
Got my taxes done- another $135.

All good- Hoping this is the tail end of any more "Vehicle Maintenance Issues" for a while- Told the Mechanic- "Hey- if you see ANYTHING in the front end that looks wonky- I've got the parts- let's get em in there while the differential is out! He saw my haul of goodies so he knows exactly what I have. Took a Pic of all the goodies- Obviously differential isn't in the pic as it is already at the mechanics place.. but this is the rest of the "lot" If you are going to be kicked in the sinkers- may as well get an "AWESOME DEAL" doing it!