The only major seal that you would want to replace is the axle seal that goes into the differential housing.
I don't have an OEM part number but here is a link to a major parts website. Just make sure you are selecting the front and not the rear.
https://www.rockauto.com/en/catalog/oldsmobile,2000,bravada,4.3l+v6,1364217,drivetrain,axle+shaft+seal,2336
Let me know if you have any other questions. Thanks
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Monday, March 16th, 2020 AT 3:45 PM