Final drive whine
 

I have a light whine on the final drive on my '93 W140 S500 {no LSD}. Are there any magic products out there to combat this or do I swap it {or turn the radio up}.

TIA

I recall reading on this forum about someone using a Redline product for rear differentials. You might want to look at this:

SHOCKPROOFTM GEAR OIL - recommended for heavily -loaded racing differentials and transmissions which see shock-loading. ShockProof contains a unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscosities. Available as SuperLight, LightWeight, and Heavy grades.

http://www.redlineoil.com/products.htm