Hi Friends,

I installed A few weeks ago a set of polyurethane mustache bar bushings.

But after this, the noise of the diff-gears increased so much , that I don't like driving with closed windows anymore. Many people her did the same, but am I the only one with with this complains ?

I'm sure that there is no metall connection what can transmit the noise.

And the diff is o.k too.

Thanks in advance

Rainer

I have done the same thing , however my Z isn't driveable yet. When I bought the R-200 the bushings and bar came with it , so I installed them. I have been concerned about this vary issue. I know that ureathane bushings on the suspention will transmit road noise and for that reason I dident use them there. My car is for street use only . If I find the noise is transmitted through the ureathene I will change them out. Gary

if only we could see what was happening when we are driving.

ive had trouble with my 280zx R200 but never had any trouble with the R180 funny that. What i did was grease one area at a time and see if the noise still accured. Theres so many moving parts it could b anything. My 240Z dosent have that problem so i wont care for now. Good luck. I know the noise is even louder when some one is in the passenger seat.

I got all poly bushings on my 280Z with a 3.9 differential. Being its a bigger diff. and that it's got the polyurethane bushings I notice some gear noise which is normal but not to the point where it bothers me at all. Only thing that I noticed with it was that it would squeek when they would move during turns and small bumps. I went under my Z and sprayed them down with a synthetic lubricant from Valvoline and that eliminated the problem.