Join Date: Sep 2005
Location: Hatfield, PA
Bikes: '64 Schwinn Traveler, '73 Astra Tour de France, '79 Fuji Gran Tourer, '86 Dahon folder, '94 Specialized Hardrock, '95 GT Timberline, 2005 Jamis Aurora
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Do the junk fork and the replacement fork both use the same type of headset (i.e., both threaded or both threadless)?
Do the junk fork and the replacement fork both have the same steerer tube outside diameter (i.e., both 1" or both 1 1/8")?
Is the steerer tube of the replacement fork long enough to work with your frame?
Changing forks may change the geometry of your bike a bit. If I'm not mistaken, many manufacturers starting producing "suspension corrected" frames in the mid 90s, so it might not even be an issue.
If the anwers to the first three questions are "no," then you'll have to beg, borrow, or steal some additional parts. I honestly don't think that I know enough about geometry to assist you much in that area.