While on a 200 mileroad trip, my Audi 100 would not shift into 5th gear. I stopped in a toll plaza, went to 1st, attempted todrive off and the trans locked down. Icome off the clutch a couple of times until the car was able to move. I checked for leaks or loose parts, none found. I then had to release the clutch a few times to get it going.There was a thump sound each time it wouldfree up and coulddrive. At every stop it locked down.I drove the last 190 miles in 4th gear. Has anyone encountered this problem? This is a Audi 100CS 2.8L, 5-speed trans with 98K miles

Lift the front of vehicle, started and went to 1st gear and rattling noise started after clutch engaged. I then went through gears and got to 5th and rattling worsen. I then went to netural with the same rattlingwhile the clutch was engaged. Could this be the pilot bearing giving me this problem?

check the shift linkage first make sure its ok ... starting with the shifter

Checked shifter and was OK, then I decided to drain the oil. Found metal gear teeth in trans. Should I have it rebuilt?

Thanks all. New Trans in on the way.