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Hello! My name is Gary.Welcome to JustAnswer.I'm reviewing your question now, and will post back with a reply shortly.
You need to contact the dealer who did your last repair as soon as you can now, stating this has just occured.
More than likely the oinion nut has been over or under tensioned.
Very common to many diffentials.
Outcome is dependent on skill level.
Hope this helps you.
I have seen how some other young guys do this type of job, and sometimes the resultant failure, exactly like yours has now.
It will need pinion bearings for sure.
If you can shine a good light at the pinion and you don't see any centrepunch witness marks, then whoever did the job has just guessed where the nut was.
Torqueing the nut after disassembly is generally to tight, since the collapsible spacer is not a restictrion to applied torque on reassembly.
3 weeks of average driving after a repair like this is a workmanship induced failure.
I hope this helps you.