What kind of oil is needed in the rearend

SOURCE: Rubbing or grinding noise coming from Driver side rear tire/wheel

I had the same problem that based on interner research is common for Fords trcuks/suvs. The common problem fro rear humming "rubbing"sound might be the rear wheel bearings/seal. These will need to be replaced as it will progressivly get worse and the noise louder and eventually the bearings can sieze. I would hesitate to take to a ford dealer if I were you as it can run $500-900. Take to mechanic that knows how to replace wheel bearings and seals. My mechanic replaced them for about $150. and the bearing and seals are around $40. A good way to test this is to raise the wheel were you can freely spin by hand...if does not spin or there is a lot of friction then it might be the wheel bearings.
Good Luck

SOURCE: metal shavings in the oil of the differential whats going on ...

The metal shaving in the oil in your diff is a bad sign, you should not have that problem if your car is new and under warranee, if the proble is within your warrantee period, take it to service.

The metal shaving in the oil indicateds your pinion (input gear) to your ring gear (driven gear), the shims may be too tight or the bearing might run out of true, therefore the intermeshing of both gear teeth is too close causing high pressure point on the tooth and wear, the metal shaving is either your gears or could be your bearing that is no longer within limited, this is a serious and sould be fix immediately.

The oil in the diff act as a seal, cool, lubricate and wash of the gears and bearing. It should not be like that if your car is less than 150,000km.

It makes noise when it is hot because the heat expands the metal parts causing them even close together, as a result too tight = rapid wearing. Stop driving and get it service or else you are looking for a new diff.

Cheers and good luck

SOURCE: Grinding when turning right or left from a stopped position

Losing turning radius is normal for 4x4. The grinding can be from hidden rear emergency brakes in back of rear rotors. The front pads can make noise and the front hubs should be checked if you do decide on replacing the front brakes.

SOURCE: My '05 ford escape started making grinding nooise

It sounds like your wheel bearing is going...

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SOURCE: humming sound going straight or turning to the

You may have a bad wheel bearing. I would say this is it. They only make a grinding noise when you turn right. Check your bearing. If you have a question, let me know. I am here to help. Thanks for using FixYA.