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89 240 automatic, rear diff is pretty wet and a very high pitch noise comes and goes.bearing? anyway not familare w/ everthing back there. Is it a major job to change the gasket and bearing?
The front diff seal and bearing is a pain in the A**. I would leave that to someone that knows how to do it.
If you have the Torque off a little bit it could come loose or the total opposite seize up.