It's funny you are posting this now as I'm also considering selling my 1983 Univega Gran Turismo. My main issues are the fit/feel, tire clearance, and drivetrain. I've been moving toward bikes that accept wider tires and I have to admit that I prefer indexed shifting to friction. The Univega is more like a sport touring bike by today's standards, and I've got a bike that fills that role better. I also have a Nashbar aluminum touring bike that I built up that is a more capable tourer and fits/rides great. So the Univega is kind of the odd man out. So, I say sell it to get what you really want/need. The only caveat is that if the Trek fits/feels perfect that you should keep it as a great feeling bike is sometimes hard to find.