I have an opportunity to buy a used 2012 John Deere 4005 4x4 tractor with a 300CX loader with 320 hours on it for $20K. It is the same or similar to a 990. It has 42 hp engine and 35 hp at the PTO. It is a 9x3 manual transmission (synchronized between first, second, and 3rd forward gears, NOT...