The Chev 2 speed transfer case doesn't have any provision to mount the arm so perhaps you have found a Ford case in a Chev?
You are correct Keith, I just went out in the frost to have a good look. I thought I had bought a professionally rebuilt Chev box, ( would have preferred a Ford). It looks like a mix and match job. No wonder it was easy to fit.
Cheers,
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Terry
F30 13 Cab CMP
Morris Commercial C8