03 5at....when cruising normal in auto, if i let off the gas the rpms drop down to 1k, then when i give it more gas rpms go up like normal and off i go. But at highger speeds like 60+ it seems like the rpsm will stay steady 1800, or 2000 or what not. is this normal on these transmissions is it going into to neutral or something?

 

Gear ratios are different for each car and at high speed your car is maximizing its operation (constant power) vs low rpm at low speed it coasts.

 

So it is normal for the rpms to drop down to 1k really fast when i let off the gas going like 30-40

 

That's what a torque converter does.

They are designed to lockup under certain situations, and not lock under other situations. What you are describing is normal. At lower speeds, the converter is not locked, so when you let off the gas, the Engine RPM drops. At higher speeds/RPM, the converter locks and acts like a clutch being directly coupled to the transmission. It's also (mostly) locked during manumatic mode, although sometimes it's a little "loose".