Hopped in my truck last night and when I turned the key to let the grids cycle, I could feel a lot of slop, when I went to start the key wouldn't turn far enough to start. So I figure I should just swap them both. I've never done anythting like this, so before I charge into it any suggestions/pointers would be helpful.

 

It kinda of depends on your mechanical abilities , most of these trucks have a tilt steering column , making the need for some experience / abilities .
It may be cheaper to take to a shop , then the tow if you get hung up .
There is one special tool required [ to make easy ] but I have been able to get around using , but have done many over the yrs.
1st thing is get a "FACTORY" shop manual only .

 

Make sure it's not a worn out key first. Mine get worn out in my pocket grinding around with half a cup of dirt.

This will help> http://dodgeram.org/tech/repair/elect/ign_switch.htm

Remember though if you have to replace the key part that you will end up with a different key for the doors.
Locksmith can fix it for a price though.

 

Also , in the yrs. of auto repair , the vast majority of sw. & tumblers that I have replace , were costumers that had a few pounds hanging on 1 key-chain , I have my key [ by its self ] in my pocket .

 

I have two different keys both do the same thing. Luckily I don't have a tilt column, so I was able to get the whole assembly out (tumbler and ign switch). Not sure I necessarily need to replace them both but seem like it would be prudent :shrugs:

 

BTW, thanks for the link infidel. So far, turns out to not be as hard as I thought.

 

Yeah, once you get into it it's not even as hard as reading the instructions.
Only special tool is the torx security bit, mine was under a buck at Napa.
You also need a torx screw driver for the steering column cover, a bit type won't fit up though the recessed hole.
Napa also has the electrical part of the key switch for $30, for some reason it goes to over $100 for '97 up though.
I've found the switch part is usually what hangs things up.
The lock part is usually just dirty and is very easy to clean out once removed.