Hi- I have a 1988 325 with the getrag 260 manual tranny that won't go into reverse. I have the tranny out of the car and it just won't go into reverse no matter how much I manipulate the shifter rod. It is not the external linkage as I have eliminated that. My question is "Is it worth tearing apart (seals, special tools, at a minimum) or should I just get a used unit?" Thanks for any help anyone can give.