You can download a copy of your warranty booklet here
. I suggest you do so just to see if you disagree with the conclusion I come to below . . . .
Unfortunately, I think you're out of luck. As I read the warranty materials at the link I provided for a 2008, your Jeep had a 3 year/36k miles general warranty. That would've covered the powertrain and everything else. Because it was "transferable," you obtained that coverage when you bought the Jeep used, but it has since expired.
Your Jeep also came with the "Lifetime Limited Powertrain Warranty," but this ONLY applied to the original owner. Because it was non-transferable, you never had it. Therefore, your warranty coverage ran out at 3 years or 36k miles.
I don't believe your Jeep ever came with a "100,000 Mile Powertrain Warranty." Jeep used that to replace the "Lifetime Limited Powertrain Warranty." Ironically, you would have been far better off with the 100k version of the powertrain warranty, because it is transferable.
Again, please download your warranty to see if I'm wrong. I hope I am.