Differential Seals

Differential Seals: Keep the Gear Oil In and the Grit Out

A differential seal is the part that rides against the rotating pinion or axle shaft where it enters the diff housing, holding gear oil inside and keeping water, dust and trail grit out. When one starts weeping you get a film of oil creeping down the housing, a dropping oil level, and eventually the whining and heat that comes from a starved ring and pinion. Fitting fresh differential seals during a fluid change, a locker install, or after a hard wet ride is cheap insurance against a far more expensive gear job later. Anyone who has pulled a diff cover knows the seal is the small part that protects the big ones.

What ThreePiece stocks

This category currently lists 3 products from 2 brands, ARB and EPI. The in-stock price range runs from $38 to $121 right now, which is a snapshot of what is on the shelf rather than a standing promise. On the housing-kit side, the ARB Sp Seal Housing Kit with O-rings (081801SP) at $121 and the ARB Sp Seal Housing Kit 81/93 with O-rings (081501SP) at $104 both bundle the O-rings you need for the job. For a complete axle-side rebuild, the EPI 09-20 Yamaha 550/700 Grizzly Rear Differential Seal Kit (WE290102) comes in at $37.99.

How to choose

The split here is simple. The ARB kits are seal housing kits with O-rings included, aimed at the ARB locker and housing side of the job, so if you are working with that hardware the matching kit saves you sourcing individual pieces. The EPI kit is a vehicle-specific rear differential seal kit built around one application. Buy on what you are actually servicing: match the kit to the housing or the vehicle in front of you rather than to price alone. Only one of the three listings carries detailed fitment data, so confirm before you order.

Fitment coverage

Named fitment in this category points to Yamaha, specifically the Yamaha Grizzly, across model years 2009 to 2020. That comes from the EPI kit; the ARB housing kits are matched to their hardware rather than a vehicle list. If your machine is not named, use the fitment calculator or call before buying.

What else you need with it

A seal rarely goes back in alone. If you have the diff open, look at Differential Components for bearings and internals, and check your Differential Covers and gasket surface while you are in there. Owners upgrading traction at the same time browse Differential Lockers. The rest of the drivetrain lives under the Drivetrain section, including Sprockets and Chain Components if you are doing a wider service.

Fitment help and ordering

Every order ships with free shipping, and Affirm and Katapult financing is available at checkout. If you are unsure which kit matches your housing or vehicle, get fitment help by phone at 813-535-5801 or reach us through contact us.

Differential Seals: Keep the Gear Oil In and the Grit Out

A differential seal is the part that rides against the rotating pinion or axle shaft where it enters the diff housing, holding gear oil inside and keeping water, dust and trail grit out. When one starts weeping you get a film of oil creeping down the housing, a dropping oil level, and eventually the whining and heat that comes from a starved ring and pinion. Fitting fresh differential seals during a fluid change, a locker install, or after a hard wet ride is cheap insurance against a far more expensive gear job later. Anyone who has pulled a diff cover knows the seal is the small part that protects the big ones.

What ThreePiece stocks

This category currently lists 3 products from 2 brands, ARB and EPI. The in-stock price range runs from $38 to $121 right now, which is a snapshot of what is on the shelf rather than a standing promise. On the housing-kit side, the ARB Sp Seal Housing Kit with O-rings (081801SP) at $121 and the ARB Sp Seal Housing Kit 81/93 with O-rings (081501SP) at $104 both bundle the O-rings you need for the job. For a complete axle-side rebuild, the EPI 09-20 Yamaha 550/700 Grizzly Rear Differential Seal Kit (WE290102) comes in at $37.99.

How to choose

The split here is simple. The ARB kits are seal housing kits with O-rings included, aimed at the ARB locker and housing side of the job, so if you are working with that hardware the matching kit saves you sourcing individual pieces. The EPI kit is a vehicle-specific rear differential seal kit built around one application. Buy on what you are actually servicing: match the kit to the housing or the vehicle in front of you rather than to price alone. Only one of the three listings carries detailed fitment data, so confirm before you order.

Fitment coverage

Named fitment in this category points to Yamaha, specifically the Yamaha Grizzly, across model years 2009 to 2020. That comes from the EPI kit; the ARB housing kits are matched to their hardware rather than a vehicle list. If your machine is not named, use the fitment calculator or call before buying.

What else you need with it

A seal rarely goes back in alone. If you have the diff open, look at Differential Components for bearings and internals, and check your Differential Covers and gasket surface while you are in there. Owners upgrading traction at the same time browse Differential Lockers. The rest of the drivetrain lives under the Drivetrain section, including Sprockets and Chain Components if you are doing a wider service.

Fitment help and ordering

Every order ships with free shipping, and Affirm and Katapult financing is available at checkout. If you are unsure which kit matches your housing or vehicle, get fitment help by phone at 813-535-5801 or reach us through contact us.