Just fitted a new quaife differential and set preload and lash appropriately, I used ep80w 90 gl5 oil and have more whine than previously. I'm just wondering what others have experienced in this respect as I'm gonna change out the oil once run in for a couple 100 miles and intend to use proper ep 90 in the hope it will improve the slight whine. Any recommendations for oil appreciated. Just for the record the whine is only slight, on the over run and easily removed with music. Jon.