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Re: Rockwell T221/SM465; Rare T-case?
That is the fill plug, the gears throw the gear oil around and keeps it all lubricated. I don't see any need in trying to overfill it.
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1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
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