Basically the extended warranty doesn't do anything for you until after the 3/36 ends. Then it kicks in but only from the “in service” date so really its always the term - 3 years and 36K miles... not really how it is marketed or understood by the average Joe buyer. Its also sold by using “fear tactics” from the F&I guy. (Not saying there’s not reasons to buy it at all, just noting the sales tactics used).
The long gone lifetime warranty was a great deal however you can bet it cost FCA more than their accountants liked, thus its demise.
My brother had a Jeep GC with the 7/100K warranty and he really used it, then sold it after getting everything possible fixed on their dime just prior to 100K.
But then the mid 2000’s Jeep's were not well rated.
I paid $1700 for a 5 yr 75K extended on my Ferd and got zero, zilch, nada out of it.
All ext warranties are a bet. They bet you won’t use it enough (or at all) and you bet that you will...
In my case Ferd won big time!
All you can do is “roll the dice” if you are so inclined. I chose not to, the jury is still out and will be for years!