The Toyota Tundra Differential Seal maintains your gear oil inside your axle housing while keeping dirt out. That simple barrier allows things to run smoothly by transferring power through the truck's differential. The Differential Seal is made of a durable rubber blend that can withstand heat and pressure. It fits snugly around the pinion or axle shaft where it spins at speed, and its lip clings to polished metal to stop leaks. The Differential Seal prevents loss of oil that can otherwise starve the gears, causing friction and clunking when turning. Over the production run, early first generation trucks applied a conventional single lip Differential Seal while later models applied a double lip type, which adds a second wiper edge for improved defense against mud and water. The double lip Differential Seal lasts longer with better tolerance for road contaminants, but the principle, which is spring pressure and precision fit, is the same in both cases. According to factory Toyota specifications, especially if you have applied your vehicle to tow loads, it should be inspected every 3,000 miles. Moreover, using genuine Toyota parts such as the oil filter will reduce the chances of early seepage. Tundra owners of the second generation notice wetness first around the pinion nut, and also a healthy seal keeps a Tundra stable when cornering under load.
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