2007-2011 Jeep Wrangler 3.8 Belt TensionerA reliable belt tensioner is essential for maintaining consistent power and performance, especially in high stress applications. Even if still functioning, a worn belt tensioner can lead to premature belt wear, belt slippage, and failure at the worst possible times. The best time to replace a belt tensioner is before you start experiencing issues. Thats why we've sourced a heavy duty tensioner specifically built to handle the increased demands of