This little guy’s job is pretty simple, really. It prevents fluids – usually gear oil in a gearbox – from leaking out where a rotating shaft comes out of the housing. It also keeps dirt and debris from getting in and messing things up. Think of it as a barrier, a sort of gasket, but designed specifically for a moving part. It’s a rubber component, usually with a metal outer ring for strength. It’s part of the drivetrain, specifically in the gearbox or differential. Any place a shaft spins and exits a housing, you'll find a seal like this. It's not something you directly see often unless you’re doing work on those components. It's tucked away inside, doing its job silently. It's a critical part of keeping everything lubricated and running smoothly. If this seal fails, you'll start to lose gear oil. You’ll notice if it does, because you'll probably see a puddle underneath the vehicle, or you might even hear a whining sound as the gears start to struggle without enough lubrication. Losing oil leads to increased wear and tear on the gears, and eventually, can cause major damage – even complete gearbox failure. Replacing a seal is a relatively inexpensive fix compared to rebuilding a whole gearbox. You can often find these online – Fixparts Online has a good selection, for example – and there are lots of videos showing how to replace them if you’re comfortable doing it yourself. But getting it fixed before it causes bigger problems is key. Eco-friendly and safe: Shaft Seal (MPN 23111228314) comes with a 12-month warranty!

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