hi everyone its been a long time. i bought a 04 last friday had to change the diff fluid because the previous owner did not use the friction additive. it helped a lot yet i still get some noise and a small vibration when turning can anyone help

 

The friction modifier needs to work itself in, it doesn't work instantly. Did you use full synthetic 75W140 and Ford modifier?

 

Yes ,just kinda losing my mind on it thinking I have change the clutches in it how long should I let it go for

 

How many bottles did you use? i had to add a 2nd bottle and it went away completely.

 

Just put bottle of the modifier , do you think putting a second will help that much

 

Give it a couple weeks. If it's still chattering put another bottle in.

 

Ok thank you guys