I have Giant ferrago 29er dual suspension [1998?] bike I picked up on the road side with a free sign. Cleaned it and lubed it. I put 10 miles on it the other day, it works 100%. It has a crmo frame and weighs 35 lbs and rides well. I was looking at the front fork it is 1” threaded and the steerer tube is held to the fork with pinch bolts. Would it be feasible to to press the steerer tube out of a 1 1/8 thread-less and install a pressed in spacer to install the 1” steerer tube?

A 1998 29er? I think not. There is a Giant Farrago hybrid from around then, but that's a hardtail.
But maybe you're referring to the suspension seatpost?
And the one I can find is listed as having an 1 1/8" headset.
Remember that a 1 1/8" threaded fork will take an 1" quill stem.

Well...
On the forks that I've seen any specifics, they've used a method called "cryo-fit" to install the steerer tubes - basically keeping the fork crown at room temperature and cooling the steerer tube to some serious low degrees before inserting it. I wouldn't feel comfortable in pressing one of those puppies out, and I'd feel even less comfortable in mounting a new steerer with a bushing.

With that said, I have mounted an 1" steerer to an 1 1/8" stem once. With steel, the steerers are pretty close to a good fit to start with.
I cut the 1 1/8" off flush with the crown.
Some slight reaming and a bit of heat and they went together smooth as butter.
Used some silver solder with good wicking action to lock the pieces together.

Just to be clear: Being able to do something isn't the same as being able to recommend it. If you go this route, you're on your own.

There was a dual suspension version, the Farrago DS.

Photo 1 & Photo 2

These bikes had forks with about 1.5" of travel.

RST & SR-Suntour still make 'Hybrid' type short travel forks for 700c wheels with 1" steering tubes.

https://www.rst.com.tw/en/product.aspx?CateID=27
https://www.srsuntour-cycling.com/ind...endenduse=city

It's probably not recommended to use a fork with more then 2" of travel on a Farrago DS.

Well, whaddya know That's more than my net search showed up. Well done!

yup photo #1 is what i have. thanks for the link to the forks, i am trying to decide if i should keep the bike and do a few updates. i ride the roads 1 or 2 hours, 3 or 4 times a week depending on weather, just to keep in shape @ 68 years. i will put some more miles on it and see how it goes.

the rst seems to be sold without the steerer tube. the fork on the bike is an rst 801 and the steerer is held only by pinch bolts, guess i need to email them and see if the 801 tube will intercahnge with the neon.
https://www.modernbike.com/itemgroup....FcU5Qgod1SUAzA