Just wanted to post this as a little FYI in case your power steering fluid (ATF) is disappearing without signs of leaks or drips etc..
On the 95.5-00 3RZ there is whats called the "power steering air control valve" that is used to bump up idle when there is any steering input. This is done so as to not stress the pump.
When the valve is open, steering is straight, the air goes in and back out of the air control valve.
When the valve is closed, steering is turned, the air is "blocked" and thus creates a sort of vacuum leak that raises the idle a couple hundred RPM's which in turn increases pressure in the pump and lets you steer easier.
Somehow this valve started leaking and letting ATF from the pump go straight into my intake manifold.
I had to literally top off the pump after every 30-40 miles of driving or else the next time I started to drive I would get a horrible whine from the pump.
I ordered a gasket kit for the pump thinking that would solve it and after rebuilding the pump with all new gaskets nothing changed.
I finally was tipped off when after letting the truck idle for 20-30 mins (while airing up tires after wheeling) and then taking off there would be a huge blue/ white cloud of smoke coming from the exhaust.
I also noticed my oil level was overfull by about 1/2 a quart. The ATF must have gotten in the crank case too.
Anyway, after the long explanation, here are some pics of the damn thing.
The old valve, missing the vacuum hoses
I crossed the hoses and then watched ATF pour out of the valve. BINGO!
The new valve and the part number
Here is a picture of an 01 3RZ power steering. You can see there are no vacuum lines leaving the pump and none going into the intake.
Picture courtesy of Johnnie
01+ 3RZ's and (I THINK!) all 5VZ's use a different type of connection/ valve to signal the pressure/ idle increase.
The 03 3RZ FSM shows an electrical connector where the ACV is.
The 03 5VZ FSM shows a different type of pressure switch. My 1999 Paper FSM shows the same type of connector like this on the 5VZ. So this must be the one setup they have. Feel free to chime in if you have an earlier 5VZ with a different type of connector.