Axle upgrade 03 Grand Cherokee
 

Hey guys I'm new to this so I apologize if there is a thread for this already.
I have a 2003 Grand Cherokee Laredo with pretty much all stock parts, other than all the crap I've had to fix (fan motor, window regulators, fuel pump, etc...) and I was wondering what would be the best axle upgrade, both front and rear. I know that the front is a Dana 30 and the rear is a Dana 35, so what would be the best way to go about strengthening the axles and all that stuff?