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As Jim said, the only way to get all the old grease out is to completely disassemble the box, scrub everything clean, and reassemble it.
Just watch those ball bearings. There are 50 of 'em & they love to roll across the floor to hide in inaccessible places. (Voice of experience here)
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'67 C20--427 tall deck/SM420, 4.10 HO52 (Michigan has not been kind to the Old Man)
'95 Caprice--355 LT1/T56/3.42 8.5" 10-bolt (daily driver, almost 300k on the chassis)
'07 Outback--wife's car. 125k & counting. No head gasket or transmission issues yet. *fingers crossed*
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