Wasn't sure what the OD off light meant. Have had O'Reilly check it for trouble codes and none ever show up. I'd press the OD button and the light would go off. As far as the tranny goes, I don't have 4K for the repair shop. Since I do have 1st gear, going to explore what all is needed to drop a transmission and if it can be done in a back yard. I don't have experience but my nephew is smart and may be able to help. Too cold to work on it now. But same nephew, and my niece's husband, just switched the serpentine belt back to the old one, and voila! no belt squealing! Plan on driving it around without the reverse as soon as I can park it on the street legally (Not allowed in winter, here)