A clunking sound that only occurs while turning is a result of broken or damaged spider gears. Spider gears do not move at all while traveling in a straight line. If this is the case then the spiders will need to be replaced and possibly the carrier as well. Be sure to inspect the ring and pinion to be sure broken debris did not damage it as well. Sergeant Clutch Discount Differential Repair Shop in San Antonio, Texas employs expert differential mechanics and technicians. Sergeant Clutch has over 60 years of experience in Differential Repair Industry. This experience helps to give you the very best differential repair service in San Antonio, TX. Sergeant Clutch Differential Repair Shop offers a huge selection of top quality differential parts and differential products. Sergeant Clutch Discount Differential Repair Shop sells and installs top quality part brands such as Timken, Dana Spicer, American Axle, National Seal, USA Standard Gear, Yukon Gear & Axle, Yukon Dura Grip, Yukon Grizzly Locker, Yukon Zip Locker, Spartan Locker, ARB Air Lockers, Detroit Lockers, Powertrax Lock Rights, True Tracs, Auburn Positractions, Auburn ECTEDs, Ford Traction Locks, Richmond Gear and more.