904 slow 2-3 shift, should I be worried?

Thanks for the replies, good to know rebuild kits are cheap at least and I do have a set of sturdy plastic hobby horses I could lay a piece of plywood over. I did adjust the KD band back when I put in the 'new' valve body. I'm familiar with the 2-3 overlap issue as the 727 in my truck does that, feels like the brakes are being tapped sometimes when it does that shift. This feels more like the opposite if anything. Sounds like I won't know until I drop the pan and take a look though. I did buy Tom Hand's Torqueflite book last year and have been reading through that to understand how it works. I'd like to think the transmission didn't suddenly kick the bucket because it wasn't shifting like this before I moved from Colorado and picked up an instant ~90 HP thanks to going from 5000+ feet elevation to basically sea level.