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Well I just changed my differential fluid out to Torco 75w-140 with Ford Friction Modifier, and WOW!! What a difference it is now! When I drained the old oil out it was ridiculously black and gunky. I was having a lot of chattering and just felt noisy, so this was definitely the cause. I put in the new oil and modifier, took it out for a drive, and no chatter what so ever and its quieter than it has ever been. It used to chatter big time when in first out of the hole, but nothing at all anymore. Definitely worth the money I paid for.

Here's a picture of the old oil :lol:
 

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My bro in law and I changed the diff fluid out on his 95 T/A. He was getting all kinds of terrible noise coming from the rear specifically while slowly turning.

Added new fluid and he picked up some GM diff fluid additive (I cannot remember what it was called) and he has not heard a thing from his rear end since.
 
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