Don't go with slotted rotors for a ranger. The slots are made to wear a very slight bit off the break pad every time they pass to make a clean surface on the pads. This wears the pads down much faster than drilled or solid rotors. Slots should really only be used for racing applications. Another function of the slots is to remove gasses from between the pad and disk for better contact. Drilled rotors do this just as well and won't wear the pads as fast.
As long as they will not be undersized after turning.
Yes. It does not make a difference whether is is the conventional, slotted or drilled rotors. They can all be machined in a brake lathe with the same accurate result.
There will be a pulsating on braking.
There is a pulsating on braking.
you can't buy new ones
If the rotors are worn too thin, they could snap apart while braking, leaving you with no braking power at all.
If rotors are smooth and shiny, they are good. If still not certain, ask at brake shop.
There was a lot of squeaking while braking when my car needed new rotors.
Excessive or heavy and continuous braking may warp brake rotors. Braking hard (heating the rotors a lot) and then going through water (which quickly cools the hot rotors) may also cause the rotors to warp. If the brake pads or brake rotors are getting thin, the rotors will warp more easily.
No, warped rotors will cause vibration when braking.
If they are warped they can cause shaking when braking.
Warped rotors