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Its in the back of the cab behind the carpet on a 1999.
If it has power locks/windows it has the raps module.
Best way to tell is to act like you are programming a fob. If the doors lock unlock after doing this, all you need is a fob.
1.Close all doors, then open drivers door and press the Unlock button on driver’s door while it is open, insert key into ignition.
2.Turn ignition from OFF to RUN 8 times within 8 seconds, with the 8th time ending in RUN. Door locks will cycle to confirm programming mode. (if the door locks do not cycle, then it was done incorrectly. You must start over by removing key and beginning from step 1)
(Off is the position where you can remove your key, RUN is the position just shy of starting your car.)