Hello I’m new to your lovely community. My mother passed away two months ago. Her car is all I have left. It’s a 2015 Lexus nx200t. She was always good with the maintenance. It’s only at 99995 miles but once I had it transported it’s been making this horrible whirling sound. I got two mechanics (one being Lexus) to take a look. They both said it’s odd but her back differential needs to be replaced. Regular mechanic quoted $3100, Lexus said today $5200. Is this normal for a Lexus, to go so quickly? It’s never been in an accident. Her warranty expired at 75k. Does one need to get it fixed at Lexus? I know Lexus cars last but now I’m worried about the upkeep and wondering if she got a lemon.