{"title":"Differential Gaskets \u0026 Seals","description":"\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eSigns Your Diff Seal Has Failed\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eA leaking pinion seal or cover gasket usually shows up in a fairly obvious spot:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eDark, heavy-smelling gear oil pooling under the rear or front differential.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eOil residue built up around the pinion shaft, right where it enters the housing.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eA whining or grinding noise developing as gear oil level drops.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eOil around the cover bolts, pointing to a failed housing gasket rather than the pinion seal itself.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eA burning smell if oil drips onto exhaust components running near the diff.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eGear oil protects heavily loaded gears running under constant pressure, so a low level doesn't just mean a mess. It shortens the life of everything spinning inside that housing.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eDiff Seal, Pinion Seal, or Differential Seal? Sorting Out the Terms\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThese terms all describe seals in the same part of the drivetrain, though they're not always identical. A diff seal is the general term for any seal on the differential. A pinion seal specifically refers to the seal around the pinion shaft, where the driveshaft input enters the housing. A differential pinion seal is just the fuller version of the same term. We list this collection under all of them, since buyers reach for whichever phrase feels natural.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eGasket Versus Seal: Two Different Jobs\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eA differential setup uses two distinct sealing parts, and it's worth knowing the difference before ordering:\u003c\/span\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cspan\u003eCover gasket:\u003c\/span\u003e\u003cspan\u003e a flat seal between the diff cover and housing, replaced whenever the cover comes off for a gear oil change or inspection.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cspan\u003ePinion seal:\u003c\/span\u003e\u003cspan\u003e a round, lip-style seal around the rotating pinion shaft, replaced when oil leaks from that specific spot rather than the cover.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOrdering the wrong one won't fix the leak, so matching the seal to the actual leak location matters more here than on most gasket pages.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhat Determines the Right Fit\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eDifferentials vary a lot between vehicles, and getting the fit wrong means a leak that returns within weeks:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cspan\u003eHousing size and type:\u003c\/span\u003e\u003cspan\u003e different diff sizes use different seal and gasket dimensions entirely.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cspan\u003ePinion shaft diameter:\u003c\/span\u003e\u003cspan\u003e varies across manufacturers and even across model years for the same vehicle.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cspan\u003eFront versus rear differential:\u003c\/span\u003e\u003cspan\u003e four-wheel-drive and all-wheel-drive vehicles often need seals for both, and they're rarely interchangeable.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eEvery listing carries confirmed fitment by make, model, and differential type, so you're matching the actual part rather than a close guess. If you're already under the car working on the transmission, checking the diff seals at the same time avoids a second job down the track.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eReplacing a Pinion Seal or Cover Gasket\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe two jobs differ quite a bit in difficulty:\u003c\/span\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cspan\u003eCover gasket replacement:\u003c\/span\u003e\u003cspan\u003e drain the gear oil, remove the cover bolts, clean both surfaces, fit the new gasket, and refill with the correct gear oil grade.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cspan\u003ePinion seal replacement:\u003c\/span\u003e\u003cspan\u003e requires removing the \u003cstrong\u003edriveshaft \u003c\/strong\u003eand pinion nut, tracking the exact pinion preload before disassembly, then pressing in the new seal and resetting preload on reassembly.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe cover gasket is a manageable job for most home mechanics. The pinion seal is more involved, since getting preload wrong affects gear wear, so it's worth having the right tools or a workshop handle that part specifically.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhy Buy Your Differential Gasket or Seal From CBT Auto Parts\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFitment matched to your specific differential, front or rear, not a generic universal size.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eCover gaskets and pinion seals stocked separately, so you order exactly what the leak needs.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eMaterials rated for constant gear oil exposure and heavy load.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFast, tracked shipping across Australia, with most orders out within a day.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eStandard parts warranty covering manufacturing defects.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThis collection is part of our wider Gaskets \u0026amp; Seals range, built to get the correct seal to you the first time, whether it's a quick cover gasket swap or a full pinion seal job.\u003c\/span\u003e\u003c\/p\u003e","products":[],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/0406\/2450\/collections\/Differential_Gaskets_Seals.jpg?v=1786471397","url":"https:\/\/cbtautoparts.com\/collections\/differential-gaskets-seals.oembed","provider":"CBT Auto Parts","version":"1.0","type":"link"}