Front right side is making a grinding noise while in two wheel, sounds like 4 wheel drive wont disengage all the way. took hub off everything looks ok. heard that it could be a vacuum problem. did notice driver side hose came off. put it back on still makes noise.

I would jack it up safely and check for side play in wheel ,very possible it's a bearing assembly

Looks like it's time for a right wheel bearing, or however many there are in the hub. I'm assuming you do not have a 4 wheel drive. Remember, if it makes noise when turning left, you are "loading" the right wheel bearing. ( Shifting more weight to the side inside your turn). Think this way. When turning left at a higher speed, the left tire might even come up off the ground! That puts all the weight on the right. If you've 4 wheel drive, could also be c.v. joints, or universal joints.

Have you checked the brakes,wheel bearings?

You should be totally stationary when you go from 2 to 4 wheel drive. There should be no grinding noise. Something has been broken, and I assume the transfer box is most likely, but it could also be the wheel hubs in front.

sound like the hubs may be bad and not completly disengaging or engaging, this will give you a loud clucking grinding type noise,i would remove the hubs and see if they are working good, or put selector into 2wd and jack the front of the truck off the ground and spin the wheel to see if the axle moves, this is so common, a think this year has the vaccum control hub too, the hubs are common, you will need to make sure the vaccum lines are connected and clear of dirt, this sound you speak of i know it sounds like it grinding metal, theres also a module that goes bad but you will need to start with the hubs.

If the grinding noice lasts for just a few seconds, don't worry about it. If it grinds along time or constantly, the hub is not disengaging fully then you need to take it to a mechanic for sure. Good Luck.

sounds like you have a bearing going out in the hub. The reason it stops making noise with 4 wheel engaged is having the truck in 4 wheel drives puts power to the front hub. Which gives it more stability. In other words you have power which helps bind and hold the bearings from more extensive travel then with it disengaged. The other possibility is you have a ball joint going out. If you are capable of inspection on these to possibilities you will need to jack it up and inspect ball joints for movement and look for abnormal up and down movement of the hub. If not take your truck in and get the front end inspected at a brake or an alignment shop.

Check wheel bering for play if there is no play , it doesn't mean that bearing is NOT bad its can still be dry and would be making that grinding sound you described Also check axle and see if boot is broken. That may be your problem also make sure that rotors are not gouged/scraped up and pads are good.Contact if you need more help and thanks for using FIX YA

Sounds like the rf hub and bearing assy has had an internal failure. Take it to a local shop and they should be able to confirm.

you need to change the wheel bearing. you need to pull out the whole hub and the bearing has to be pressed out and in again with a new one