I have a chance to swap my 78 fj40 4 speed transfer case for a 64 three speed case.I am worried about the strength of the metal on the 64 case,but I want the added gear reduction.I allready have the twin stick linkage so I won`t use the vacuum linkage.Could a transfer case saver eliminate any crack issues?P.S. I have a sm465 and sbc planned,so I will have to buy an adapter somewhere.Any input appreciated.I might be worring about nothing,right?