I did more research into this. It is true.
All Nitros get the heat shield with or without a transfercase.
The issue is; that without a transfercase, IE 4X2, when the heat shield comes loose it will drop down, rub on the driveline, and literally cut through it. This is because the driveline is made of hollow aluminum. Once the driveline is cut in half it drops to the ground. The front of the cut driveline can dig into the ground causing the rear of the vehicle to be projected into the air. Or the cut driveline can strike the top of the tunnel hard enough that the SRS system sensor, between the front seats, thinks the Nitro has been hit and deploys the airbags, thus potentially causing an accident.
So the report is true and there is a recall for the 4X2 Nitro.
Recall # N10
The "fix" is the dealer will add a bracket to the shield to prevent it from dropping onto the driveline if it comes loose.
Which is a band-aid fix. I think they should make it so the shield does not come loose!
Here are 2 documents you can download with more info about the recall.
But neither one is the actual recall notice.
This Doc has details on the defect.
Click here.
This Doc has info on the "fix".
Click here.
This is all the info I have at this time.