If they were the adhesive mylar or cut vinyl, heat or chemicals will work. The old water-soak style decals are a little tougher, but crinkling them with heat is a good place to start.
A heat gun could get hot enough to bubble the paint even on the low setting if you get in too close or linger too long with it, but can work fine as long as you keep it moving and keep a distance, and stop as soon as the decal starts to release and curl up. A safer bet is to use a hand-held hair dryer on the high setting. It will take longer than a heat gun but won't get hot enough to hurt your paint. With either, the aim is to soften the adhesive underneath and cause some shrinkage to the decal itself (without actually melting it) to help separate it. Then you can clean up the adhesive by just wiping, though a solvent might be needed to get it all.
Which gets to the second method, which is to use a solvent that is sold as a bumper sticker remover. Most auto parts will hae something like that. It's the same idea but much gentler than gasket remover, which will eat paint. You might ask a used car dealer with a shop what they use to clean up cars for sale.
Any chemical or solvent, whether used as the primary way of getting someting off or just to clean up after using the heat method, you would want to test it on an obscure part of the tractor (the underside of the axle housing comes first to my mind) to make sure it won't harm the paint where you intend to use it.
Only other thought is that moving decals is something better done sooner rather than later, as red is a notorious color for fading and, if your tractor is out in the light a lot, you'll have a tell-tale darker area where a decal has been removed.
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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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