2004 silverado front right wheel grinding.

Joe, Could be a few things, U joint, E brake shoes falling off inside rotor, bad bearing in diff. better take it into a good tech. and have checked. too hard to diagnose from here. "Check the attached links,instruction and guides, Good luck
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Grinding noise Chevy Silverado and what caused it
So the front seal on my 2004 Chevrolet Silverado rear Diff was leaking so...
http://www.fullsizechevy.com/forum/general-discussion/technical-maintenance/415961-grinding-noise-coming-under-truck-rear-truck-help.html
Understanding and Diagnosing Rear Differential Noise Fuel Friction An...

Wheel barring or bad alignment

possibly a wheel bearing or c.v joint .

hub bearing or possible front differential

Sounds to me like you have a bad front hub. The good news is that the wheel speed sensors are part of the wheel hubs. The tricky part can be to figure out which side is bad. If the noise is worse when turning right, it is most likely the left side that is bad. You could try jacking up each corner and shaking the wheels to see if there is any play.

My 2004 Silverado is displaying a similar issue - but it grinds loudly on either a sharp left or right turn at slow speed - it feels like it is winding itself up terribly then releasing that energy in burst as it skips & hops along. If you shut the truck off in this position, then try to restart it, it will lurch forward a good foot as soon as you turn the key. I have no idea what the problem is

when turning left vehicle distributes weight to right front wheel bearing causing load. since u describe a noise in right front while driving straight i would suspect failed right front wheel bearing. see if your noise changes/goes away while turning right that should tell u 4 sure

Loud popping/grinding most noticeably heard when turning is normally a sign of a bad CV joint. Look under the van where the axle half-shafts come out of the transaxle and connect to the backside of the wheel assembly. Are the rubber boots on the axles torn or missing?
If you hear the popping only in left turns, your right CV joint is bad, If you hear the popping only in right turns, your left CV joint is bad.

That Sounds a lot like you have a Gear Broken off inside the Transfer Case. Not a Cheap fix or Easy Either But, Necessary