it sounds to me like lsd rear chatter. change your fluid to red line fluid I think its gl-4 fluid but I'm not 100% sure check your owners manual or service book. I just used the redline with now lsd additive, I have used it in the diff for over 8 yrs and it see a lot of track time and auto-xing. goood luck hope it helps.
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1979 SA F Prepared solo/ Track day car 12a w/Weber carb,RB header and exhaust,
Ground Control coilovers, camber/caster plates
GforceEng.panhard rod w/ tri-link,Panasports wheels w/Hoosier slicks.
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