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OE Toyota fluid worked fine when the cars were brand new. As the diff wears though, the Toyota fluid isnt good enuf to protect the diff and keep it quiet.

Its just that the Ford fluid is better suited for a high miles Supra diff. It keeps them quiet longer and protects the discs inside. Dont ask me why, it just does!

Redline synthetic differential additive works well too, especially with the appropriate Redline gear oil.

Give it a try!

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