I have an 1984 8820 for sale. The main difference between a regular titan and titan two is that they made the shaker longer on the titan two which means the sieve and chaffer are longer. Also they sped up the shoe speed, which most people have changed back to the slower sprocket which causes less wear and tear on the shaker assembly. Also on the titan twos the return elevator is a little different as far as chain adjusting goes. Cant seem to see any difference in capacity. The combine I have for sale is field ready and is reconditioned. Have any questions on it email me at perisptr@hcctel.net and I can send a picture of it.