Are wheel bearings covered under the Chevy Powertrain Warranty?

I’m thinking of adding some aftermarket parts to my Chevy but I don’t want to mess with the warranty. Can I add features to my Chevy?

I want to pay off my car loan early and my mom told me that I should pay toward the principal of the car loan. I’m not sure how to do this. What’s the best way to make payments toward the principal?

"I have medical payments coverage for $10,000. My car insurance company is saying they can send me the check to pay my bills, and then my health insurance will pay the rest. My health insurance is telling me to have my auto insurance pay the hospital directly, and then they'll pay what's left. Does it matter what I do? Will everyone get paid eventually by the at-fault party?"