Originally Posted by fpierce
I'm wondering if anyone could help me out? I started feeling a shutter in the rear end of my mustang gt 02 when the car is going from in the 35-40 mile an hour range it seems like when it shift is when I feel it. It doesn't do it any other time. I change the oil in the rear end and it seemed to help it for a while but I think it was a coincidence. Any suggestions would be appreciated. Thanks
Did you put in any friction modifier additive when you changed the oil?
If not you might want to add some and see what that does before you tear it down for a rebuild.