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MTD
MTD
I'm not positive, but I think it is Craftsman.
transmission or transaxle
The same as any riding mower. The following is a site which explains how the work: http://www.ehow.com/how-does_4689999_rideon-lawn-mower-work.html
MTD
Toro Titan
You probably have a bad bearing.
Check the belt.
John Deere all the way. Either John Deere, or Craftsman. They're the best.
The engine, I think
John Deere. History of reliable products second to none in the industry!