I am really sorry to hear about the FRont Diff problems you are having. That really isn't fun.
My transmission is still working okay but continues to have a noise coming from the front when engine braking. I know that when the time comes I will be going back to Subaru for a remanufactured trans. They include the front diff and planetary gears in their 2 year warrantee. Basically everything in the trans and diff housings is covered.
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May your transmission live forever.
SuperbVehicleXtraordinary
Proud sponsor of a 1992 SVX.