Gearnut: I don't have specs on these tractors anymore, but I farmed for years with both 560 and 656 diesels, and a 300 gas. Other than hydraulics 300 and 460 torque case are same size. Neither one are as large as 656.
The difference between 560 and 656 can be decieving, because of attachment of frame rails to clutch housing. The 656 had changes made to TA from the days of 300, 460 and 560. I know 300 had a 10" clutch, expect 460 had the same. 656 has an 11" clutch. I don't remember size of 560 clutch but I expect it is 11", same as 656. The reason I say that is I do have specs for 706, 756, 766 and 966, and all have a 12" clutch.
Having said the above I suspect the drivelive of 656 is equal to or heavier than 560. I admit the case looks smaller, so does the rear end case look smaller. I put 11,000 hours on my 560, 15,000 hours on my 656. Transmission top was never off 656, however transmission top was off my 560. My 560 and 656 did virtually no loader work, thus clutches and TA went roughly 10,000 hours on each tractor.
I think your accessment is flawed, over the years casting improvement evolved to point companies were able to build smaller looking casting that were actually stronger than old ones. I also had a 1066, throw in that for comparrison, 656 looks ok to me. If you want to take it one step further, throw in a W-40 for comparrison.
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