I have an 02 OZ rally with 175k miles. I was driving on the interstate when I felt a vibration in the clutch, soon after clutch went out and I cant shift into gear. The brake master cylinder is still holding fluid, but I don't see the slave cylinder. I heard it may be internal. Any sugestions appreciated.

 

Try bleeding your master and slave cylinders really well. It may not work though. The way it went out it seems like you may have bigger problems like you need a new clutch, but it's always good to start with small stuff so bleed it out first.

 

Your 02 is infact an internal slave. That being said if it were leaking causing your clutch issues you should see brake fluid dripping down off your bellhousing of the tranny.

 

+1 one on both these answers!^

Look for fluid on bottom of bell-housing and also on fittings on clutch and brake lines.
It sounds to me like you've gotten a leak and air in your lines but it could be your clutch too.
Our cars are bad about the slaves going out and leaking.

Do bleed slave and check for any fluid at all.
Also would be good to bleed the master on all 4 wheels as well.

 

How do I bleed the slave cylinder?

 

There is a bleeder valve sticking out of your trans where the hydro hose connects. You have to have someone in the car. You open that valve and have your helper slowly push the clutch pedal in all the way and hold it to the floor. Then you close the valve and have them slowly bring the pedal back up. Open the valve, clutch to floor, close valve, pedal up etc. Do this a quite a few times you should have air pockets come out as well as fluid and the pedal will get stiffer if thats the issue