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I finished installing my SPL bushings and been driving my car for 2 weeks now mostly freeway. Another thing that I did during the install was put a VLSD on my open diff pumpkin. The only thing that bothers me now is the loud high pitch sound coming from the diff. The faster I go the higher the pitch of the sound and it's not very healthy for the ears because it's really loud. Is this normal if you are using the SPL solid bushings or maybe because there is something wrong with my diff? If this is not normal then I will have to check my diff first or just switch to Nismo bushings if that is normal for everybody.
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