Link to GT275 manual part numbers for JD GT275...

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Link to GT275 manuals for attachments for JD GT275...

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Link to JD parts lookup...

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Quote "Are these good garden tractors", yes about the best you can buy if they were taken care of and you can afford them. Only one better IMO would JD318 without the onan engine (nothing wrong with onan other than about none existing parts). IMO the best GT JD ever made!

I like the 318, my inlaws have one. But I don't like the dash slider (rabbit) hand control for ground speed, too much stiction and not as convenient to adjust speed. Would much prefer foot pedal control like on the next generation JD 400, 425, 445 and 455. Always wanted a nice 445....maybe someday. But they use that 318 to not only mow their lawn around the farmhouse, but also the grass in the drain ditches on both sides of the highway. The thing's a beast and still comes back for more.

IMO 318 built like a tank and has hugh serviceable and accessable rearend. Which is good think most of the time! And to some all the time!/!. Did I say that!

The GT275 is a fantastic machine. I wouldn't say it's the best, since the 240-245-260-265-285-320 built at the same time had a heavier frame, and the 425-455 were really the flagship garden tractors built by Deere back then. However the GT series are very capable machines. I own two of them, a GT225 (next gen) and a GT262 (same as yours but gear-drive). It is comparable to the X500 series sold today.
The GT series is the entry level of Deere products which are made to not only cut grass but till the soil as well (either using PTO-powered tiller of a single bottom plow with a sleeve hitch). Any attachments designed for either generation of GT series will fit your tractor. Your tractor is the first generation of GT series which included the GT242 (14hp), GT262 (17hp), and GT275 (17hp hydro). It will also shares attachments with the LX series.
Some attachments for it include the 30" mechanical tiller, 42-48" front blades, 42" snowblower, sleeve hitch, and pretty much whatever you want to tow behind it. The advantage of having a garden tractor, even if you never rip up the soil with it, is that the transmission can take hauling heavy cartloads of firewood or dragging a plug aerator with 150lbs of weight without fear of smoking your transmission. Note that your frame did not have the mounts for the snowblower or front blade integrated, so you'll have to install the attachment kit to make those work. Front-mounted attachments for the 245/265 series made at the same time WILL NOT WORK with your GT series. They are the same except for one critical difference: the beams which connect the blower or blade to the lugs on the center of your frame are straight on the 245 type, but the GT series requires the beams with a slight bend to them. Do a search on eBay and you'll see what I'm talking about.
There is a compatibility chart out there which details exactly which attachments go with which tractor by part number, but I haven't been able to find it. This link will help out. Type "GT275" into the model search and it will list the attachments.
Ebay is a great source for used attachments for these tractors.
The main complaint about these tractors is the weak hinge design for the front hood. If you dont' have one, I highly recommend buying a brush guard for the front. One bump and the hinge is broke. With the age of the tractor the plastic is no doubt brittle. A new hood is well over $300.
You can do a search at the bottom of the page to read all the posts I've written about my beloved GT tractors over the years.
It's a great tractor, have fun with it!

Here is a link that might be useful: jd parts

Thank you for the information. I took it home Sunday. It is very clean and appears to have been taken care of nicely. I think the hours are 200-300 given its history and the property size. I got the tiller and a number 10 pull behind cart, a gravel rake, chains and weights.

You got a tiller with it too? Wow, that's a huge bonus. I just used used mine to fluff up the garden this afternoon. It's so much easier than a walk-behind.
Any day now I'll have tomatoes and peppers in the ground! I can taste them now..