95man
Guest
The sprocket difference is 3 teeth on the shoe drive. THe yellow top combines had the 15and18 toth sprocket and the T 2's had the 18 and 18 sprocket - you can interchange them. About 6 dollars difference between the new and old. All variable speed feeder houses had reversers, the fixed, long style feeder house could be either stationary or reversible. Don't know of any 7720's around here. Gg