I have a 1981 240D automatic tranny and today I took the car out for a drive on the highway for ~30 min. then stopped at work for a few hours as I was about to go home I realized my car would no longer go into reverse. All the other gears work normally, fluid level is fine and I hear no grinding sound like its trying to go into reverse but can't. Does anyone know what might be going on??? I am going to climb under the car tonight and see if anything looks crazy out of place but I don't know really what I should look for. Any ideas would be greatly appreciated. Thanks.
-Drew