I have not checked that. Actualy, I am not sure which part that is, where does it connect to? Hmmm..Axle shafts huh? How does one know if it is bad? I took it to a shop and was charged for a diagnostic and of course they "could not replicate the problem", which is funny because I can feel it every time I drive....I am sure they just drove it around the parking lot and said it seems fine to them...I told them they have to take it on the interstate. Also, it kind of vibrates if you are on the interstate and there is a dip and the car floats up and down, on the down side of the bounce, it vibrates??