Let me start off my saying that I have the limited slip with the 3.55's. I have a shutter coming from the rear end and it's the clutch packs going out. I was talking to a guy today and he said the reason why I have the shudder is that the previous owner changed the fluid and never added the friction modifier. The clutch disks are glazed and are creating the issue.

Now I have never heard of this before but he told me to empty the rear diff fluid out and fill it up with diesel fuel and run it for a mile. Then empty the diesel out and replace it with the fluid and friction modifier. Has anyone ever heard or done this? Will this really work?

 

Just drain it, And spray everything down with brake cleaner. Thats what i did.

 

That stopped the vibrations and rides smooth?

 

Yep, I used Royal purple gear oil and a 7ounce bottle of friction modifier.