Can you use this fluid in any transmission ? I have a 2003 Buick LeSabre with 117,000 miles with common hard shift problem not too bad and not all the time was told its a solenoid problem.

You might want to consider Lubegard "Red". It was recommended to me many years ago by a reputable transmission shop. I've used it in every transmission since with no ill effects and hopefully beneficial. If you solenoid is sticking, and not a mechanical issue, it might help.

Transynd is the best atf you can buy, but it won't cure a transmission problem. Get it correctly diagnosed first, repaired if needed then run it or the recommended fluid. If you just want to pour it in and run it, that's fine, won't hurt a thing.