Lagging when shifting?? (727 auto, w/ full manual valve body)

My apologies. What's happening(or feels like it is) is when it shifts from 2nd to drive(when I manual shift it) it revs high, then you finally hear the tranny go into drive. Almost like it goes to neutral, but it doesn't. It does do it from 1st to 2nd but not as bad as going from 2nd to Drive. And the other thing, is it NEVER started F-ing up until I took it to that transmission shop.