Output shaft removal...plz help~

I had a problem with not getting O/D and i found out that my tranny sprung a leak that is coming from the output shaft...the gasket that actually holds the output shaft to the transmission, i have taken the driveshaft off and taken most of the bolts where it connects to the tranny, but it is not getting loose and I am wondering if I have to take the crossmember off to take the output shaft off so i can replace the seal? I am working on it now and hopefully someone can chime in here so i can get this thing fixed up. Thanks.