This is a 2008 vehicle that is still under warranty. Let the dealer deal with this. You paid for the warranty, use it.
Stick shift.
There are several things that can cause your 2005 Jeep manual transmission to shift hard between first and second gear. The most common cause is a malfunctioning shifting fork.
If a 2000 Jeep Wrangler suddenly loses power in 5th gear, it might be a problem with the speed sensor on the transmission. This sensor regulates when the Jeep will shift or should shift.
Worn synchonizer?
your shift lever bushings are bad, easy fix.
Your synchro is going bad.
Stick shift, yes. Automatic, no.
To exit manual mode in a Jeep Grand Cherokee, simply shift the gear lever from the "M" (manual) position back to the "D" (drive) position. This will switch the transmission back to automatic mode. If your vehicle has paddle shifters, ensure that they are not engaged, as this can also keep the vehicle in manual mode. Always refer to your owner’s manual for specific instructions related to your model year.
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If it will shift when the engine is off, but not while it is running your clutch is not working
Look at the gear stick, if its auto then you have an auto transmission, if its manual you have a manual transmission.
sell jeep and just buy the manual one