I called the shop and they denied anything, but I fixed it! I had a friend get in the car and move the shifter from park to 2nd and all the gears in between while I laid underneath (yes, I took measures to make sure it would not roll onto me lol) and watched the linkage move on the driver's side of the tranny. There is a small flap of metal that functions as some sort of guard/heat shield for some wiring harness right next the the shift linkage, and at some point during the swap or pull, the tranny shop had bent it up to where it just blocked the linkage when it got to the "L" position. I just got a metal bar long enough to reach it and bent it back out of the way where it belong and it works fine again! Whew! Such a relief. I'm tired of tranny problems lol. Thanks for all the tips though guys!