I picked up about a week ago a 94 mighty max for $800 bucks. It ran fine and shifty really good. Today when I started it this morning, it would grind really bad going into reverse. No other gear will grind but lately it's been getting a little harder to go into 1st but no grinding. Once in reverse it will run good and won't pop out of reverse. I've tried to hold the clutch for a couple of minutes before going into reverse, tried to go to other gears before into reverse and double clutching but it grinds every time. Sometimes it will go in fine. But 95% of the time it will grind bad. It feels like the synchronizer doesn't slow down the gears. So my question is what can I do to fix this problem? I have put close to 1000 miles since I bought it and never gave me problems shifting and now it's taking a huge dump on me with this reverse grinding.