Wisbaker may have been talking about how the M chassis got different engines with more rpm's and more horsepower from about the same displacement as it evolved into the Super M, the 400, the 450, the 560 and 660 tractors.
Are the 656, 666 and 686 tractors further updates of the M chassis or was the 656 a completely new design like the 706 line was?
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Today's Featured Article - Tractor Proflie: John Deere Model R - by Staff. The John Deere Model R, the last of the lettered tractors, was the first diesel-powered tractor produced by John Deere with a gasoline starting engine. It was also the first tractor they produced that had an optional steel cab. The photo above shows the tractor w
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