Dana transaxle, very similar to a Perless, which you can find manuals on line. You don't say if you have a 4,5 or 6 speed , but my guess is a 5 speed. That being the case my guess is that after sitting for 3 years the shift collars are being blocked by hard grease, not allowing the keys to get past the first collar. Try this, jack up the rear end, shift it into 1st gear and with an assistant turn both wheels forward slowly. As you are turning try forcing the shift levering into 2nd. You might get lucky and get the keys to move. If you can't get it to move you will have to pull the tranny and open it up. Then again you may just disregard my post, as you posted in another thread, I'm just a bully asking for a muffle belt.