Rear axle whine

Just thought I'd pass on my experience with this issue with everyone. My 08 GT started having a pretty good whine in the rear end from 65-75 mph while under load. It started a few months ago at around 3k miles Apparently it's a pretty common problem. Well a month ago Ford came out with a TSB for it and it involves an axle dampening weight on each side of the axle. The holes are even already there! Well this took about 50% of the whine away ( I was supprised) so I decided to let it be rather than tear into it. The car has 12k on it now ( I drive a lot) so I decided to try one more thing. Well guess what....Royal Purple 75w140 Max Gear took the rest of the whine out! I've read a lot of good things about this stuff and at $15 a quart at NAPA it better be good. Needless to say I couldn't be happier. If anyone has a little whine in theirs this may well be worth a shot. Sorry for the long post but wanted to pass this along.

fox1x said:

Thanks, I'll give that a shot... I have a little whine also; mostly while turning though.

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Thats sounds like maybe a lack of friction modifier in the fluid. Its required with most gear oils. The Royal Purple already has it so thats a savings also. I did not add any when I did the fluid swap and have had no strange noises from the limited slip.