It never hurts to change the differential fluid and it takes so little you might as well use good stuff. We use: http://www.redlineoil.com/products_gearlubricants.asp
The trans does just fine with 30k services with filter and a good Dextron III fluid. If you really want some over kill Redline also makes a really good synthetic:
http://www.redlineoil.com/products_gearlubricants.asp?productID=51&subCategoryID=18&categoryID=8
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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