HD4 Steering clutch and final drive questions

Hey there, I'm Josh,
This is my first post, but I have been watching these forums for a year now and I appreciate the rich source of knowledge. Thanks in advance for any possible information.

I have a 1968 HD4 Crawler Loader that I am restoring. The machine sat (outside in tarp - in Canada), for 6ish years before coming into my possession.

First I had to rebuild the Roosa master pump because the plungers and metering valve were seized. Then I had to replace most of the electrics and all the filters. I also changed all the oils and fluids. The help of this site and the AC site were paramount in my success so far.

I am now working on the undercarriage and drive portion of the machine. I've removed the ripper and winch for easier access to the rear and the machine is now up on blocks.

Question: Could a seized clutch be responsible for the a track not turning or does the lack of rotation definitively indicate a failed final drive? If so, what part is likely to have failed?

Information on the Problem: simply put, the right track doesn't turn. The left track turns forward and back, the clutch lever idles the track and the brake stops it. The crawler will track forwards and back on one track. The right brake also works, so I can turn to the right when in reverse. The steering clutch lever on the right is very stiff. It barely moves (once at the end of free travel - currently 8 in. from dashboard - left is same free travel). When inspecting the clutches through the top covers, one can see the left side [splined shaft] clearly moves back and forth when pulling the lever. However on the right side the movement is less than 1/2 in. The right side track is also very loose.

The previous owner, who has since passed, said that the ability to turn got worse and worse till one day it didn't work at all. At that point he was 92 so it was parked.
Any info would be much appreciated before I go about tearing it down.
 
If problem is final drive, it should pull engine down when you release left clutch and apply right brake. MACK
 

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