If you've ever spent time cleaning an old differential seal or sealant, do yourself a favor and get these instead. I have a Jeep TJ which means the differentials need fluid. change at least every two years if not every year and I can't tell you how much I HATE old baked RTV razor blades. So I figured I'll spend cabbage on these pods this time. No fuss, no fuss, freaked out, and after two weeks not a drop of gear oil has escaped. Yes, they're $20, which is about $16 more than a tube of RTV, and while they should be refillable, I don't know what another year is. But even if they do need to be replaced, $40 every year or two is worth me for both diffs instead of cleaning and cleaning and cleaning.
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