well normally you could hold the horn and right or left sideshift button on the handle while turning the truck on to gain access to the passcode menu, then the default password for raymonds were Ray1 and Ray2 but chances are they have been changed. Raymond is notorious for doing this so unless you know the access password you will not gain access to do the relearn without their assistance.

You can try to just put the handle on and hope it is close enough to work but that's a long shot that it will work.