Tranny Help!

[81Scottsdale520]

So i have a 350 turbo automatic tranny and im not sure if its low on fluid or just giving out. the problem is that its not shifting accurately, like it takes about a few seconds before shifting and at the time it should shift it has the engine revving, the reason i ask about the fluid is because the dipstick is im guessing not the correct one because it is way off. and i ask that because i know that the fluid needs to reach a certain pressure or something for it to shift? i just wanna know what you guys think before i do anything..