Front differential bearing and seal kit designed to restore proper drive feel in a wide range of 4x4 ATVs and utility side-by-sides in the 500cc+ class. This kit replaces worn front-diff bearings and seals to prevent oil leaks, reduce play, and eliminate drivetrain noise, delivering smooth engagement and confident performance on rugged trails and farm work. Built to exact OE-like tolerances, it provides a durable, drop-in solution that simplifies front-end service without aftermarket guesswork. This aftermarket replacement kit focuses on reliable wear-sparing components that handle the harsh conditions of off-road use. It targets common failure points—loose or pitted bearings and oil seals—that can lead to differential leaks, heat buildup, and uneven power transfer. With correctly sized bearings and seals, the kit restores preload and seal integrity, making it a dependable choice for trail riders, landowners, and fleet off-road equipment operators.

Comprehensive Vehicle Fitment

Manufacturer	Models / Series	Years / Details
Polaris	ACE EFI 500	2017
Polaris	ACE EFI 900 EPS	2016-2017
Polaris	Brutus HD 900	2013
Polaris	General 1000 EFI	2016-2017
Polaris	Ranger 1000 Diesel	2015-2017
Polaris	Ranger 1000 Diesel Crew	2015-2017
Polaris	Ranger 4x4 570 Full Size / Crew	2015-2017
Polaris	Ranger 4x4 900 Diesel	2011-2014
Polaris	Ranger 4x4 900 Diesel Crew	2012-2014
Polaris	Ranger 900 Crew	2014-2017
Polaris	Ranger 900 XP	2013-2017
Polaris	Ranger Diesel HST/Deluxe	2014
Polaris	Ranger ETX 325	2016
Polaris	RZR 1000 60 INCH	2016
Polaris	RZR 4 XP Jagged X	2013
Polaris	RZR 4 800	2011-2014
Polaris	RZR 4 900	2016
Polaris	RZR 4 XP 900	2012-2014
Polaris	RZR 570 EFI	2012-2017
Polaris	RZR 800	2011-2014
Polaris	RZR 900	2015-2017
Polaris	RZR S 800	2011-2014
Polaris	RZR XP 1000	2014-2016
Polaris	RZR XP 4 1000	2014-2016
Polaris	RZR XP 900	2011-2014
Polaris	Sportsman ACE 325	2014-2016
Polaris	Sportsman ACE 325 HD	2015
Polaris	Sportsman ACE 570	2015

Product Specifications

Attribute	Details
OEM Reference Part Numbers	Multiple OEM references vary by model; refer to the fitment table for exact cross-refs
Type	Front differential bearing and seal kit
Manufacturer	Aftermarket Replacement
Application	Front differential bearing and seal assembly for listed ATV/UTV models
Material	Bearing components: high-strength steel alloy; Seals: elastomer (NBR or similar) with metal housings
Dimensions	Contains multiple bearings and seals sized to fit the listed models; exact sizes vary by model
Bearings Included	Multiple front-diff bearings (specific counts per kit vary by application)
Seals Included	Oil seals and dust seals matched to each bearing size
Lubricant/Capacities	Gear oil compatible; quantity varies by model and kit composition

OEM & Aftermarket Cross-Reference Information

Part Number	Brand / Type	Cross-Reference Notes
Various OEM numbers per model	Aftermarket Replacement	Cross-referenced by fitment; exact cross-refs depend on model/year

What’s Included

Everything you need for a front-differential refresh in one box. The kit includes:

• Front differential bearing set (multiple bearings as required)
• Front differential oil seals (paired to each bearing)
• Dust seals for protection against dirt ingress
• Retaining rings / snap rings required for proper seating
• O-rings and small hardware necessary for the cover interfaces

Note: Related gaskets, lubricants, and additional fasteners not included unless specified for a given model.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility—engineered to match OE dimensions and bolt patterns for the listed models, reducing installation guesswork.
• OEM Cross-Reference—carefully aligned with common OEM part numbers to help verify correct selection across model years.
• Premium Materials—high-grade bearing steel and durable elastomer seals designed to withstand mud, dust, and heat.
• Performance Restoration—restores proper preload and lubrication, eliminating play and preventing premature differential wear.
• Comprehensive Coverage—the kit is designed to address a wide range of Polaris front-diff configurations in the 500cc+ class.
• Cost-Effective Longevity—a single kit that supports routine maintenance cycles, reducing the risk of roadside failure and costly repairs.

Installation Notes:

• Drain and clean the front-differential enclosure before removing components to prevent dirt from entering bearings.
• Inspect mating surfaces for galling or pitting; replace any damaged housings or covers to ensure seal integrity.
• Use a proper press or bearing installation tool to seat bearings squarely; avoid hammering to prevent bearing damage.
• Lubricate seals lightly with clean gear oil or assembly lube during installation to reduce seal-dry-out and facilitate seating.
• Check seal orientation before seating; incorrect orientation will cause leaks even with a new seal.
• Torque to spec per service manual when reinstalling adjacent fasteners and covers; ensure even torque to prevent warping.

Why Upgrade?

Running worn front-diff bearings or oil seals can allow oil leaks, gear misalignment, and excessive heat, accelerating wear on the differential gears. This replacement restores proper lubrication and preload, delivering reliable power transfer and extending drivetrain life for demanding trails and farm work.