Whinning noise i have change the rear end and still make s the noise

NISSAN.
what is smoking?
engine bay,
radiator (up front)
tail pipe end rear, or where we can not see the car so.........
what is running hot the dash temp gauge> or?
got coolant AF antifreeze landing on the ground (green pooling)
whinning noise, , in park, or in drive (a/t box) or both?
or engine, whines all the time ? parked or driving

now i open my crystal ball (ESP max grade)
and say water pump is bad.
ENGINE , most likely is this. open hood and see LEAK , i bet. here.
3.5 L VQ35DE V6

A whinning noise while turning is an indication of a worn bearing. The extra pressure put against the bearing/race during the turn and the closing of a gap creates this noise.I would chech the axle bearings on the side of the truck on the outside the curve when you hear it. What I'm saying is if you hear it when you turn left....check the right side bearing

Most likely your differential ring gear carrier bearings are worn and the alignment of the pinion gear to the ring gear is out of tolerance. If your truck is full time 4x4 from the factory there is also a good chance that the rear differential housing is also worn where one of the carrier bearings (left side most likely) is mounted. This is a fairly difficult repair to do at home due to the close tolerances that need to be measured to make sure the two gears mesh properly. If the differential housing is damaged then the entire rear axle should be replaced.

Depending on how many miles are on it since the gear oil has been changed, some metal will be normal. If the differntial wasn't whinning or making noise i would drain it, remove the housing cover and thoroughly clean it. Then refill with fresh gear lube. I recommend using a synthetic.
Good luck, i hope this helps.

If the outer bearings can go bad, so can an inner bearing. A close visual inspection will usually reveal a bad bearing or you can feel it when you spin the bearing. You could check the gear grease in the rear end. Bearings in there can go bad.

It could possibly be your rear end/transfer-case/transmission/power steering. Where is the noise coming from and when does it mostly occur?

you have a wheel bearing going out. see if it gets quieter if you turn one way or the other that will tell you what side it is on

If the rear end is whinning it is probably safe to say that it is already damaged and will need to be replaced to correct the problem but there is a fill on the passenger side near the yoke side. It fills level with the plug hole.

Bearing going out on alt, power steering, AC, ect. put a long screw driver to your ear them the sharp end on each unit to listen for the sounds it makes.

i had the same problem with my 98 dodge durango it has the same 12 bolt rear end and what i had to do is change all my bearings