If you're talking about an extended warranty, only buy it from Chrysler. Avoid all the TV barkers selling warranties for old cars or private warranty companies, that's nothing but a scam. I bought an extended warranty for my '95 for about $700, but anything that would have been covered broke after the warranty period. When I had an International 4300, I bought their 7year/50,000 mile coverage for both the engine/engine electronics/Allison transmission for a little over $1000. I never needed it, but it saved some bacon for the next owner.
On my signature truck, I passed on the warranty and never needed it, so I'm ahead on that one.
Another factor is whether or not you can do your own repairs. If not, the warranty may be worthwhile if you have to run to the dealer for every little issue.