I have purchased a 1946 Ford 9N. The shifter will go into 1st and 3rd, but will not budge into reverse or 2nd. I have taken the cover plate off and the shifter forks are not broken. There is evedence of moister in the transmission along with some rust on some of the gear teeth. I have pryed, hammered and applied penetrating fliud on the shift rail. I can only get that shifter to move less than a 1/64". Any suggestions???