2002 ford f350 can't get keyless remotes to work?

Bought two new transmitter for this truck at the auto zone. I've only had the truck a year and never came with remotes but the guy at the ford dealership said that i can get them and do it myself. Ok so i did the 8 on and off things ending in the run position but the locks never cycle. Is there somethjng i'm doin wrong or does the truck not have the alarm system? My book says it should have the system. Any help is appriciated.

The Alarm will Arm.Disarm when the car is locked/Unlocked with both the Key and Remote.
If the Central Locking is working with the key in the Drivers door then it is just down to the Remote side.
First of all have you checked the battery is in it the right way up and was there a piece of paper/plastic between the battery and the contact. (Normal to save the battery until required). If they were not in sealed packets check batteries. After that it is down to a Re-Matching problem.
My car you sit in car close doors switch on Ignition (Do not start it) you then have maximum of 10 seconds to Press and Release either Lock or Unlock button.

Andy C