How big is the container you moved it from and how big is the container it's in now? And how often have you watered it? Temps?

thanks for the reply. its in the same container it was in previously which is a 2 gallon pot i believe. when i repotted, i root pruned it as well. temps have been up and down with a few nights in the last few weeks at or below freezing. the very cold night we had(in the 20's) i moved it into the garage where the temp was at least 40 degrees. I water it every 2-4 days days but ever since i changed to the gritty mix i havent quite nailed down the frequency water is needed.

I probably would have opted for a larger container for that selection - a 2G container is a bit restrictive. And that would have eliminated the need for any root pruning at this time. If you believe you are providing sufficient water - gritty mix is hard to get used to re: watering requirements - then I would guess what you are seeing is a bit of transplant shock in reaction to the root pruning so close to leaf out. Just keep properly watered and protected from any extreme cold and it should recover in time.

Obviously we can't be there to see the plant in person,so may I offer an alternative view to consider? My first impressions were the same,root pruning etc. must be transplant shock.However my gut feeling looking at the pics. is too much water causing total wilting like that.Gritty mixes aren't the be all and end all we think.They take a lot of experimenting with as GG says.My 1st forray into a gritty mix was a disaster.Although I had perfect drainage,the roots had lots of air and weren't sittiing in water,the porous element of my mix simply held too much water within the granules and I lost many plants.The answer would've been to use less of that element or a substitute but I lost interest.
I'm sure if you get it right they're wonderful,but different variations to Al's original recipe and different circumstances may mean you can't simply pour on water without worrying,you can still overwater these mixes if not perfect.
My suggestion would be to try and judge by weight if the pot is holding a lot of water within(there's no other way with these mixes) and if so try and dry it out for a while.If you don't think so then I sincerely hope GG's diagnosis is correct as I don't want you to suffer as I did :)

thanks again to both of you for your insight and suggestions :) Ive made two batches of gritty mix thus far, the first batch i screened out all of the fine turface by passing it through only a 1/8 screen rather than just a 1/16 screen. I realized my mistake after i got next to nothing out of my big bag of turface. I ended up losing all the small turface particles that I imagine are responsible for more water retention. this tree is in the first batch of gritty mix with the bigger turface particles. I regularly feel like the gritty mix is dry even after 6 or so hours. could the trees stress be from under watering? I looked closely and saw a few very small brown tips on some leaves. the three other maples (diff varieties) i repotted and root pruned at the same time are all still healthy/happy. I really hope this little guy recovers, its still got the same limp dark petiole on many of the larger leaves. is there anything i should be doing to make sure the plant isnt stressed? should i keep it in the shade or give it more sun?

I'd give it more shade until you figure out the right watering regimen for the media you made. Give it some time to grow more roots before subjecting it to full sun.