Strange Engineering differentials are arguably the finest US built rear ends available. Known for their strength and quality, these differentials are equally at home on the street and the track. Arriving to you completely assembled, the solidly built 9-inch differential includes everything needed to put a tough 9-inch into your ride. The steel housing with a traditional round 9-inch center is available in widths from 52-inches to 60-inches, forged axles with your choice of 31 or 35 splines, a complete nodular iron center section with True Track posi, and your choice of gears. The housing is in raw steel and ready for your weld-on brackets, whether it's spring perches for leaf springs, or brackets for a 4-link system. Performance and strength from an American company that stands behind each product. Truly plug and play