Transmission Gaskets and Gearbox Seal Kits

A transmission gasket seals the joints around your gearbox housing, pan, and valve body, keeping fluid inside where it can actually do its job. Called a gearbox gasket in a lot of workshops, this is the seal that fails quietly, usually showing up as a spot on the driveway long before anything feels wrong when driving.

CBT Auto Parts stocks transmission gaskets and seals matched to your gearbox type and model, from older Turbo 350 and Turbo 400 units to newer 4L60E and 700R4 builds. This collection sits within our wider Gaskets & Seals range, next to differential gaskets and seals for anyone working on the full drivetrain. Orders ship fast across Australia, most within one business day.

Transmission Gaskets & Seals

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FAQs

1. Is a gearbox gasket the same as a transmission gasket?

Yes. Gearbox and transmission are interchangeable terms for the same unit, and the gasket names follow the same pattern.

2. What's included in a transmission gasket and seal kit?

Usually a pan gasket, valve body gasket, and shaft seals, covering the joints most likely to leak during normal use.

3. How often should a transmission pan gasket be replaced?

It's typically replaced during a fluid service, especially if fluid is already showing signs of leaking around the pan.

4. Do you stock gaskets for older transmissions like the Turbo 350 or Turbo 400?

Yes, alongside kits for newer platforms like the 4L60E and 700R4, plus fitment-matched parts for other makes and models.

5. Can a transmission gasket leak affect how the car shifts?

Yes. Since transmission fluid also drives the hydraulics that shift gears, a low fluid level from a leak can cause slipping or delayed shifts.