Where is the clutch master cylinder and slave on a 94 explorer xlt?

On a 1994 Ford Explorer XLT, the clutch master cylinder is located inside the vehicle, typically mounted on the firewall, near the brake master cylinder. It's usually fairly easy to spot because it's connected to the clutch pedal by a pushrod.

The clutch slave cylinder, however, is located on the transmission itself, usually near where the clutch fork is connected to the transmission. You'll need to get under the vehicle to see it. It's a smaller cylinder than the master cylinder and is connected to the throw-out bearing. The exact location on the transmission will depend slightly on the transmission type (manual, of course).