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I used Delco Supreme 11 DOT-3 last time I ranger'd it. Tried to buy the same stuff from the dealer last month and it has been superceded by a DOT-3 'Brake & Clutch Fluid', not to be confused with the Delco Super DOT-4 Clutch and Brake Fluid which has been available for a while and is used in the Ranger video.
The first time I ranger'd the clutch, I used the Super DOT-4 fluid and the clutch squeaked when it was depressed. Immediately changed it out for DOT3 and the squeak went away. My .02.
the caps were put on when DOT 3 was the recommended fill. Now GM has changed the recommendation and says to go with DOT4. You can mix 3 and 4 no problem just remember if you mix 3 and 4, you just have a full fill of DOT3 afterwards. The difference is a higher boiling point of DOT 4. GM also updated the plug specs and oil specs as well so what was written when the car was new is no longer 100% valid.