IH had mounting subframes, hydraulic connections and assorted brackets for quite a list of tractor models for the 3121. The TD-340 doesn't appear to be in the list. Since the TD-340 A was discontinued in '65 and the 3121 didn't come out until '65, is isn't surprising that they didn't bother with that combination. With 504 and 3414 in the list, it would seem that your crawler could handle it. Dedending on what subframe is on your backhoe, it might take quite a bit of fab work. I suggest you get a copy of the parts catalog for the 3121 to get a better idea what you have to work with.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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