96 7.3 loss in rpms
 

I got a 96 7.3 auto, ts 6 position , 3 in down pipe and 3 in straight pipe. And k&n intake (I know its junk) . While driving home tonight it shifted fine until the last gear and the rpms would drop to 1200-1400 rpms it seems to shift early. With the rpm drop it had a lack of power. I hit the gother fast pedal to see if I still got good boost and I did. But rpms didn't rise quickly like usual. Tran my was rebuilt with a billet converter 11000 miles ago and has 1000 miles left on warranty. Anything I should check other then having them look at it?