Dave: What size are the tires both front and rear on your 140? I ask as I just want to be sure we are talking about the same tractor. I would think if your tractor is high crop or high clear none of those blades will work without modification? The high crop tractor sits about 6" higher than any or regular Cub, SA, 100, 130 or 140 thus the pitch of the push arms on any blade from a regular tractor would be so steep the blade would ride over just about anything you try to push. To make this work, you would need to fabricate a drop frame placing the push arms pivot about 12" to 15" off ground level.
Having said all of the above, those IH blades all designate two criteria in the model, that being the number indicates width of blade and the letter indicates tractor it fits as in letter series. Any blade designated A will bolt up to a A, SA, 100, 130 or 140. And yes the mounting hardware would have to be different for a Cub, but don't rule out reversing of the same mounting hardware.
Those blades started at 54", followed by 60", 72" and 84", and quite possibly 96", not certain on that last one. The blade design was the same on all of them, just the fabrication material got heavier. IH always suggested the A-60 for SA, 100, 130 or 140. I had one of those blades and sold it for two reasons; the push frame is not heavy enough to withstand what the SA, 100, 130 or 140 can dish out. That will be even worse if you have 36" tires on rear. Second factor, a 60" blade is not wide enough for these tractors, thus one finds himself pushing snow and having snow fall in around wheels. This can get one in a lot of trouble, finding yourself bogged in snow worse than if you have no blade.
I sold my A-60 blade and built one of my own fabrication. It is a 72" angle blade and the push frame is probably 5 times heavier than the A-60. There were a few minor items I had to beef up on my blade, however since doing that I've used it trouble free for several years now. Back when I had the A-60 blade I was giving consideration to mounting pto driven welder on back for ballast and daily welding chore.
I you want a photo of a blade that can withstand anything these tractors can dish out plus bolted to the tractor in enough locations to protect tractor castings, send me an e mail, and I will return photos.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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