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Okay, I am sure I am just being paranoid and falling into the new owner trap of listening to the S2k's "noises" too closely, but put my mind at ease. I did a diff. change last weekend. Car has 3500 miles, drained the nasty break in oil, put some royal purple 75W90 in there. I know, I know, I did a search and I know how most of you feel about the "purp" but they were out of mobil 1 and my other choice was some off brand dino gear oil. AIt seems that I can hear my diff a lil more after the change over, is this normal? Now when I sayt I can hear it, it is mostly the deceleration whine when coming to a complete halt or the intial take off whine going from first and second into third when accelerating gently. I cannot hear it cruising at say 40-60, or if the radio is on at all, even at like 2 volume bars, the noise is not audible. Is it normal to be a little louder when going from the break in oil to a synthetic? I think I will probably change the diff oil again at my first oil change in say, 3000-3500 more miles to be safe, and put mobil one in it then.
I'm not too sure about this but I think the diff can whine when the oil put in, even though it's the correct viscosity, is too thin. PM S2KPuddyDad and see if he can't give you a better answer.
If you have whine on de-cell I bet the load on the pinion bearings is lost, this will cause diff failure very fast.
There should be 7 to 12 inch pounds of turning torque on the pinion flange
This is damage on the cost side of a pinion done by this issue. This pinion was very loose and had more than 70 thousands travel, this is an extreme case.
You need to check this by un doing the axle bolts both side of the diff and removing the drive shaft from the diff. Drain the oil then check.
If you get no reading on the tq wrench this is your cause of whine.
You should remove the old nut, clean the threads, replace with a new nut, tq down to 94 foot pounds to start then increase by 10 foot pounds till you get 7 inch pounds of turning torque on an inch pound tq wrench. Try not to go more than 7 inch pounds because, with the rear having a heavy oil inside you will not get a accurate reading. It is best to air on the side of caution and not over load the bearings.
in the above ref. to Puddydad's post..... All I did was change the diff oil to Royal Purple on a 3500 mile car, and I am pretty sure these noises were there before, and if you are on the gas AT ALL or have the music on 1 bar, you can't hear them....Do I need to disassemble the diff???!! If I do, Hell, I'd rather do that than get a new diff. I guess, I kinda have almost resolved myself to the fact that these are normal noises, everyone who has ridden in the car say s it's fine, granted, I haven't had any S2k drivers in there.... Anybody in the north DFW area wanna take a ride in a probably fine S2K to see if the diff needs looking at?
in the above ref. to Puddydad's post..... All I did was change the diff oil to Royal Purple on a 3500 mile car, and I am pretty sure these noises were there before, and if you are on the gas AT ALL or have the music on 1 bar, you can't hear them....Do I need to disassemble the diff???!! If I do, Hell, I'd rather do that than get a new diff. I guess, I kinda have almost resolved myself to the fact that these are normal noises, everyone who has ridden in the car say s it's fine, granted, I haven't had any S2k drivers in there.... Anybody in the north DFW area wanna take a ride in a probably fine S2K to see if the diff needs looking at?
You do not need to remove the rear from the car but, you should follow the steps I laid out for you to check if it is ok. If a qualified person takes a ride with you and hears nothing going on then...I guess your ok
whine after diff oil change?
