One of the characteristics of the ZF is, condensation tends to form inside the case. The less you drive your Pantera, the greater a problem this becomes. Water, air and steel bearings, gears, etc. don't coexist well together. This is the reason to change gear oil annually. This is also the reason that your brand new, spare ZF, that's been sitting in a crate, untouched for 40 years, is probably junk by now.
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