Actually, unibody construction was rather state of the art when these were designed.
Ford had made the first unibody car, the 1960 Lincoln continental, less then a decade before.
With that technology, engineers were able to make thing stronger and lighter.
And, perhaps most importantly, a little less expensive!
I'm sure it helped Jacobsen to sell the design to Ford as well. And, if it helped lower the purchase price of the tractor, I'm sure the dealers liked that!
As for "a fresh out of school engineer designing that" from my thirty years of doing design work, I can assure you, who ever approved that design, had forty or fifty years of design experience on tractors.
As far as damage to the oil pan gasket surface, or ease of replacing the engine every forty years, I'm sure it was never even a consideration!
It would be interesting to know how Bolens influenced the design of these tractors. They'd been making their tube frame tractors just across town for almost ten years. There may have been some trading of design engineers.
With that I end may rant!
And, thanks for indulging me!
Welded oil pan
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