Can someone tell me what the different spring positions (A, B, C and 1 or 2) are for. The manual says put spring in c and 1. Mine was in b and 2 position and still is. Dealer mechanic said they represented different shift points, but couldn't tell me what they were. My machine (8485 hours) has tons of power on take off and runs 20 mph with 22 inch tires. Just wondering.