Need utility Side by Side

[ArlyA]

Who does John Deere have make their SxS for them?

You should try google.
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The John Deere Corporation makes John Deere Gator™ utility vehicles, which are designed and built at their plant in Horicon, Wisconsin. The company has produced these multi-purpose vehicles, often used on farms and worksites, since the first Gator was launched in 1993.

 

[ArlyA]

I’m assuming they are a clone of someone else’s engine, that seems to be the Chinese way

That does not make them bad and JD would be contracting whatever there specs would be.