Hi, I'm new to these forums but have lurked before. I recently bought a '83 Trek 400 that I have fallen in love with. A few days ago I was riding to class dodging people and hit a driveway that was higher than the street due to campus construction (tuition increase) and I went over the handle bars while the fork and skewer bent under me. I fared better than my poor bike. my question is this, what is a suitable replacement fork that looks true to the original? It has suntour stamped on it. Thanks

a pic would help evaluate, but sometimes a steel fork can be bent back to usable form (by somebody with skill). More important is to inspect the junctions of the top tube and down tube to the head lugs for any bulging or cracking, if the frame is also damaged you'd waste your time fixing or replacing the fork (and front wheel).

I just checked the tubes and they are free of damage. Here is a picture of the fork, sorry the quality isn't great but it is the best I've got.

nice to see it in another plane (like 90º to this) but from what I can see it sure looks like something I'd try to have straightened. Do you have a good frame fixer or LBS with "old guys who know their stuff"?

Here is another angle. Bending the fork back is alright? I've always heard that it is pretty much a no no to rebend them. I'm all for it though if it means saving the original fork.

one of the great things about steel (including steel forks) is that you CAN save them by bending them back, very much a yes-yes (at least to give it a try). I've seen some pretty remarkable 'miracle' saves to forks that were a lot worse looking than this one...but here's where an experienced eye and hand (in person) counts.
Try posting a thread in the framebuilders forum for a recommendation to do this fork saving job in your (Ohio) area...and good luck.
if it fails, comeonback and ask for a replacement in the "ISO/Trade" thread in this forum.

Ok thanks for the help. I'll take it to my lbs this weekend and see if they are comfortable with this. If not I can get a replacement and hold on to the old one until I find someone that knows what they are doing. I have looked for the threading and measurements for a new one in the manual and on vintagetreks.com and can't seem to find any answers. Do you know by chance?

I have had good luck tying the steerer tube down with a couple of U-bolts, and lifting with a car jack, using a simulated "axle" as the lifting point, thus imparting a load in the exact opposite way in which it was loaded during the mishap. It's simple to do (if you have a jack).

This is worth a look;
https://cgi.ebay.com/ISHIWATA-VINTAGE...#ht_500wt_1154

Thanks guys for the input, I have found this, https://cgi.ebay.com/27-FORK-/1206187...item1c156fb80d , do you know if this is a suntour fork? I'm guessing it is since Univegas are Japanese. But more importantly would it fit?

Measure the steerer tube from your current fork. It's usually measured from the flat part where the lower bearing race sits to the top of the threaded part (you'll have to take the big nut off to see it.)

I don't think there is such a thing as a "SunTour" fork, just the forged fork ends which are stamped as such...and those were used on many brands, not just Japanese either. As Ben says, the crucial measurement you need to match (or go over by just a little that you can take up with a spacer) is the steerer length, and of course if it's 27" or 700C wheels. A minor match is the forkcrown race diameter: could be 26.4 or 27.0, this can be compensated for with another HS race that fits or by milling at an LBS. Yours seems to have nutted brakes, that's another detail to consider.
Yours is 1" and has ISO threading, but can't tell you the length or forkcrown race diam.,you have to measure... good chance that the fork was made by Tange (a guess) with eyelet-ed ends by SunTour.