Increasing your tires a small amount up to maybe 35" shouldn't do anything harmful to the drivetrain. I doubt 37's would add much more wear and tear. Wranglers are made to run bigger tires from the factory, so the rig can handle it. Your 4xe has some pretty heavy duty parts to cope with the extra weight and power of the 4xe system as well. If you have a Sahara with 3.73 or a Rubicon with 4.11's all the better. The only thing I would do is get JScan or a Taser to let the computer know you have bigger tires.