Well, Dave, you may be right on a wider Elwood gear not allowing two wheel drive in fifth: only four wheel drive It's hard to tell now with everything buttoned up. That is something I didn't consider.
It would be interesting to view some original Elwood literature to see how an owner should operate the modified tractor. It is interesting that you mention M's only running with first thru third in 4wd. How common were the early Elwoods back in their day? One in a thoudand tractors or more like one in ten thousand? It also seems to me that most Elwoods were found on 660's.
I thought about counting the 4th gear teeth but it would have required moving the tractor with a come-a-long to get a good count. Too much trouble.
You said "But as you said the planetary gears would throw it off." I don't think I said that. I said the Elwood would work with with a TA. The IH main-shaft doesn't care if there is any prior reduction whether it's in the TA or transmission. However, I have always wondered why and when the TA was welded up. One of these days I will replace the welded TA with a good unit.
I have a feeling that all the Army surplus axles had the same gear ratios. Any ratio changing was performed with the four triplex chain sprockets.
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