Does that trans have an actual dipstick ? Any chance you may have over filled it a little ? As I'm sure you are well aware of, GM has a long history of shift shaft seals leaking when the converter drains back on many of their transmissions. Just a WAG at this, since no other opinions yet... 
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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