What is the fine-grained topic of the following text: TeraFlex was the first aftermarket manufacturer with a suspension system for the TJ Wrangler, and is still the only aftermarket company to offer a solution for the venerable 231 transfer case’s low range gearing. Only return the topic.
TeraFlex's aftermarket suspension systems and solutions for TJ Wrangler's 231 transfer case's low range gearing.