mullahi

ok I have two options for my transmission upgrade either to buy new T56 magnum or to rebuild stock transmission and upgrade it from tech performance the only thing I am worried about the T56 magnum is that I need to cut the drive shaft to fit in my F body and as I am not from states so when I order the upgrade for t56 likewise I am worried about the replacement of the transmission in my country so any other suggestion for me from other companies which they have some other transmission ?