problem getting into gear TH400

[Camaro_Dan]

ok, well, the oil is new, has been changed a few times just last year, with no more then 100miles between changes because of leak. the leak was around the dipstick hole. may that be the problem?
I have heard somewhere that the "governator" or whatever it's called could stick if the transmission have been sitting unused for some time. could it be that I need a new filter, that this one might be cloged? and the oil has a hard time getting through?
the converter is also new, no more then 100miles on it.