dragula-
I'm not aware of ANY factory alarm system on Super-Dutys. But there's an easy way to test for one: Start truck, roll down driver's window. Shut truck off, get out, close door and then lock with remote. Wait 60 seconds, reach in thru open window and open door from inside. If horn starts honking, you've got an alarm.

fatherheart3-
you have to turn the key on and off at least 8 times (maybe 10) to program an additional remote. Just keep turning the vehicle on and off till the doors lock and unlock, then you can program your extra remote. But you have to do all of them at that time, even the previously-programmed ones.