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Hi Tom You are getting crazy. Go and buy a good 80-90 rear diff fluid and add a posi lube additive from GM. The additive is a friction modifier to help the grip on fiber discs in your posi rear. If you beat on the car hard, change the fluid every 12000 miles. This is the best system for your rear. After your put the fluid in the rear, do hard right and left turns in circles to mix the fluid and modifier into the fiber material. Put some water under the wheels and do a quick burnout to make sure the posi is turning both tires. When done go for a road test. A new rear may drag around a turn until it breaks in. Good Luck Rick Lake
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