Differential Gaskets and Diff Pinion Seal Replacements

A differential seal keeps gear oil inside the diff housing, sealing around the pinion shaft where it enters the case and around the cover where it meets the housing. Most people just call it a diff seal or pinion seal, and when it fails, gear oil finds its way out fast, usually right where the driveshaft meets the differential.

CBT Auto Parts stocks differential gaskets and pinion seals matched to your diff type and model, front or rear. This collection sits within our wider Gaskets & Seals range, close to transmission gaskets and seals for anyone working through the full drivetrain. Orders ship fast across Australia, most within one business day.

Differential Gaskets & Seals

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FAQs

1. Is a diff seal the same as a pinion seal?

Not quite. Diff seal is the general term, while pinion seal specifically refers to the seal around the pinion shaft entry point.

2. What's the difference between a cover gasket and a pinion seal?

The cover gasket seals the diff cover to the housing. The pinion seal seals around the rotating pinion shaft. They fail for different reasons.

3. Can I replace a differential pinion seal myself?

It's more involved than a cover gasket, since it requires resetting pinion preload correctly. Many owners leave this one to a workshop.

4. What happens if I ignore a diff seal leak?

Gear oil level drops, which accelerates wear on heavily loaded internal gears and can eventually cause a whining or grinding noise.

5. Do you stock seals for both front and rear differentials?

Yes, matched to your specific vehicle and differential type, since front and rear seals are rarely interchangeable.