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Power Brute LSD chatter


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I have a Power Brute LSD in my 73 240z (v8 6 SP). The rear chatters way too much for my liking. I swapped the diff fluid to Royal Purple Synthetic that has the friction modifier already in it. The chatter was reduced substantially after the fliud change. Can I add more friction modifier to reduce the chatter further? I have not been able to find much info on rebuilding the rear that will reduce the tightness of the rear. I do not want to give up the lsd but I do not race the car and I need to find a way to make it more streetable. The diff only has about 2000 miles on it. I only put about 1000-1500 miles on the car per year and I am guessing that it will take alot of miles before it wears enough to be more streetable. Any suggestions?

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