The Powertrax Traction System is the latest design in traction adding differential technology. It combines the smooth operation of a limited-slip differential, with the traction performance of a locking differential. A precise synchronization mechanism eliminates the ratcheting sounds typical of other locking differentials. Special gear and spring design reduce the backlash and therefore driveline windup. An ultra-strength alloy material is used throughout, which is 67% stronger than titanium. Installation is simple because no ring and pinion set-up is required. In addition, no special tools or oils are needed (installs in about one hour). Step by step model specific instructions are provided with every kit. Positive traction - full locker Delivers engine power to both wheels when coming off the lineUpgrade and improve your times and your vehicles reputation. Smooth quiet operation - fully automatic. Do-it-yourself - installs in about one hour. No special tools required. Works for both cars and trucks. Gives 2-wheel drive trucks the traction power of 4x4s. Excellent replacement for Trac loc style lockers. No special gear lube required. Use 85W-140 in warm climates, 80W-90 in cold climates. Item Details31-tooth, 1957-Up Open Drive Warranty - For details regarding warranties, reach out to Richmond. Feel free to give them a call at (800) 583-GEAR during their operating hours from 8 AM to 5 PM Eastern Time, or send them an email at [email protected]. They would be happy to assist you!