| Re: Third differential installed after second one was in only 300 mi!! Had mine replaced at 10000 miles, whining real bad. The second one was making noise right from the start. The third one is getting louder all the time. They didn't put in the additive on the third one and it was making the same noise as yours, so after 1500 miles I changed the fluid and added the additive. That stoped the grinding noise when turing but the whine is still there and getting louder all the time. |