That would be a real major project. Whole power train is different including flywheel on back to differential. Not sure if rear housing would even work as suction tube is different and not sure of bolt pattern to bolt on a torque amplifier housing. Then you would have mechanical and hydraulic connections difference also. The 656 is the forerunner to the 70 and the 666 and 686 are same vintage.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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