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80-90 oep diff oil unless it is a limited slip diff in which case you use special limited slip diff diff oil
don't know if it is limited slip diff diff
you can check by jacking up the rear end and having a friend turn a rear wheel
by holding one wheel the other wheel will be turning in the forward direct as that is what limited slip diffs do diff do ( both drive )
other than that call your local manufacturer service center and ask
You don't say what type of car you have and what mileage it has run so far.
Most likely the whine is from a very worn pinion gear.
Other than replacing or rebuilding the diff there is nothing you can do other than drain the old diff oil and replace it with new oil. ONLY use the manufacturer specified differential oil in the correct grade. This may quieten the noise a little but any difference will be minimal. It may help extend the life of the worn diff a little and it will get rid of any debris suspended in the old diff oil..
The diff drain plugs are often magnetic to pick up metal to prevent it being recirculated so check if there is much in the way of metal filings on the drain plug when it is removed.
Without disassembling the diff no one can tell you how long it may last but they are expensive to replace so I would be replacing the vehicle sooner rather than later if you don't want to replace the diff.
Until you sell the car, drive it gently when moving off from a stop and when accelerating to minimise stress on the diff.
If you are going to replace the diff oil yourself the car will need to be level and ensure you loosen and remove the diff oil filler plug before you remove the oil drain plug. If you drain the oil and the filler plug is stuck you will be in trouble. It will be a lot easier to just buy the correct diff oil and take the car to a reliable mechanic to drain and refill the diff for you while the car is up on a lift/hoist.
diff overheating is from incorrect mesh of the crownwheel and pinion
that can be from too little clearance , too much clearance of failing bearings and too much preload on the pinion bearings
it can also be from incorrect oil level in the diff to the bottom of the threads of the fill plug
it is time to pull the diff and check the bearings
the problem will most likely be the bearing behind the pinion as that one takes all the load
diffs normally run hot but it is the escaping oil that is the problem
that could be from bearings on the pinion allowing the lip of the flange seal to not seal properly
hi this might not have anything to do with the actual gear box, this sounds more like your clutch is on its way out, the wine you hear may be the thrust bearing bearings worn, and the no drive in 6th gear means that it has worn to the extent that it will not drive 6th gear, it will be better to get this checked out, but i am pretty sure it is not the actual gearbox...hope this helped
Have you check the driv aksel on left and right side, if you have a bad drive shaft , you shall hear a noise specily if you turn the steering to full right ore left. And so can you check the drive shaft betwen the aksel and the reduction gearbox.Have you check the oil in the front diff , if the are metall partikel in the oil? if the are mettal partickle in the oil , you must check the diff