I have an NAA and have had 8n's, 2N's, and 9N's. Never had a 600 myself, but have friends that do.
The NAA uses the same basic rear and transmission as the older 8n with an upgraded overhead valve engine. The NAA hydraulics are improved over the 8n's (ie hydraulics independent of PTO operation) but are somewhat unique. The NAA's were only made 1953-54 and were replaced with the 600 series tractors. This two year lifespan makes parts a little harder to find. The 600 series tractor used the same basic engine as the NAA but had heavier, simpler rears and improved hydraulics all around. There were also upgraded transmission options along the way, ie SelectoSpeed, Five speeds, Live Power options, etc. The basic hundred series tractors lasted into the 60's and there are many more of them and correspondingly more parts available.
This summary is fairly simplistic and has exceptions, but these are the basic differences. If you are going to restore a tractor for show or hobby, any will do. If you really want a working tractor, the 600/800's are probably the way to go.
I just noticed that you want to bushhog with your tractor. I would not bushhog with an 8n,9n, or 2n. The hydraulics and PTO operation are not really efficient for this. The hydraulics do not work unless the PTO is turning. This makes control difficult. Also, you'll have more power and a heavier tractor with an NAA or Hundred series.
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