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D-4s have very little clearance underneith.

Yup.

I've seen quite a few of the John Deere rubber track crawlers the past few years.

You see a few of those around here also. They look to be like the challenger, best of both worlds. Flotation and traction of a track, and speed and the ability to run on asphalt of a tire.

Another advantage to the high sprocket was ease of removing the final drives and the tranny. They could break the track and remove the whole component out the side and I believe the tranny came out the rear, but I'm not certain. On the low sprocket tractors you broke the track, removed the...

That's cool Ed. I've seen a few pieces of Loadall equipment around and the JCB hydraulic excavators.

They are geared down by the final drives but yeah, they got to have some power. Not too many people know about Ben Holt Al. The family still owns the Cat dealership in Stockton and Los Banos. Caterpillar took quite a blow to their corporate ego when they missed the 2007 EPA emissions standards...

I had a D-5 26X. The final drives were inadaquate.

I always wondered why they didn't do this in trucks also. Eliminate all that shifting. My Dad has a Caterpillar RD-6, 1938 model and it has a beltless engine. Took them 80 years for it to become new again.