Originally Posted by WS6 #4541
I just changed my fluid about two weeks ago. I put the GM additive in there and used Castol 75w 90. Since then it is whinning rather loudly. I am going to change the fluid again but what weight of rear end fluid would you recommend me to use to quite me rear end down?
By changing the oil you might have lifted the fosfate of of the inside of the housing, and the new oil might be contaminated. Did you clean out the housing with any type of cleaner before adding new oil?