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Lego designed the most complex gearbox ever made for this model and I can attest to its complexity. The image above shows the underneath of the vehicle including the gear boxes, differentials, drive shafts, independent suspension and steering systems. It all works too! It goes into drive and reverse gears, high and low range and also into 2 wheel and four wheel drive.

So, it actually have a motor?

Take a look at the post, there's images and the text explains it in full. I'd rather not re-type it in a comment.

I did but it does not say motor. It says shaft. It says this thing and that thing. But I don't know if they are just lego parts or if they are mechanical.

It's mechanical, but is not self propelled. See this video.

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