OK, I'll take a shot at this, from memory. A few weeks ago I had a look at the installation manual for my '95's keyless entry (Mopar). There were instructions for teaching the truck to recognize a new fob. As I recall (I don't have the instructions available right now) here's what you do:
Within 5 seconds do steps 1 & 2:
1. Turn the key on
2. Turn the dome light on and off 3 times... or was it 5 times?
The system should enter learn mode, which it announces by beeping several times. After you hear the beeps, press the "number 1" button on the fob (I'm not sure which one is the #1). I seem to recall the truck will beep again once it learns a fob, but maybe not. If you have any other fobs for this truck, punch their #1 buttons now, too (when you program in a new fob, the truck forgets all the old fobs it ever knew, so you need to program all fobs in the same session).
When you're done, turn the key off.
Keep us posted, and good luck. I hope this is what you needed?