Gears & Axles - Will Heavy Oil Reduce a bit of Gear Whine?

I have new gears and they whine a bit, buy only 60-70mph, light throttle. I could live with it, but it is annoying since that's how I'm usually driving. Someone said heavier oil like 80W-140 would make it quieter. Right now I have the GM recomended stuff which is 75W-80.

Anyone successful with heavier oil and a quieter Gear? Thanks!!

i am in the same boat and was wondering the same.

i had 75w90 in my 12 bolt and it whined then i swiched to 85w140 and it made it a bit more quiet. but im still breaking mine in. just my 2 cents