Front Differential Seal Kit Polaris 500 ACE EFI 17 900 ACE EFI EPS 16 17 Brutus HD 900 13 Ranger 1000 Diesel 15 17

Restore front differential integrity on a wide range of Polaris ATVs and UTVs with this Front Differential Seal Kit. Designed to seal the front diff against oil leaks and contaminant ingress, it covers models from the ACE and RANGER lines to RZR and Sportsman families, making it a smart, cost-effective service for trail, farm, or worksite use. Replacing worn seals today helps prevent gear oil loss, overheating, and excessive gear wear, keeping the drivetrain reliable under demanding conditions.

This aftermarket replacement is engineered to deliver a precise, OEM-like fit with durable seals and O-rings that stand up to grit, heat, and vibration. It’s a practical, proven choice for riders and operators who depend on consistent front-diff performance without the downtime or expense of factory parts. With a straightforward, direct-fit design, you’ll get back on the trail or on the job faster and with confidence.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

This kit includes the essential seals and O-rings required for a complete front-differential service.

• Front differential oil seal
• Input shaft oil seal
• Internal oil seals (2x)
• Housing O-ring

Related parts such as gear oil, differential gaskets, and mounting hardware are not included in this kit.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility – Engineered to match OEM bore diameters and lip configurations for a clean, leak-free install.
• OEM Cross-Reference – Backed by a broad cross-reference matrix to ensure you can source compatible seals without OEM pricing.
• Premium Materials – High-grade nitrile seals and robust housing components built to resist heat, dust, and hydraulic pressure.
• Performance Restoration – Restores original differential sealing efficiency, reducing oil loss and contamination risk during heavy-use trail riding or farm work.
• Cost-Effective Service – A complete, affordable alternative to OEM kits with comparable performance for routine maintenance intervals.
• Reliability in Tough Environments – Designed for muddy, wet, and dusty conditions common to off-road and agricultural operation.

Installation Notes:

• Drain differential oil and thoroughly clean the differential housing and mating surfaces before installation.
• Inspect pinion and output shafts for wear; replace any grooves or scoring that could compromise seal life.
• Use a proper seal driver or a socket of matching diameter to seat oil seals evenly without distortion; apply a light coat of clean gear oil to the seal lips prior to installation.
• Replace the housing O-ring if present, and ensure mating surfaces are perfectly clean and dry to prevent infiltration after assembly.
• Avoid over-tightening any mounting hardware around the differential cover; follow vehicle service manual guidelines or avoid using impact tools on seal surfaces.
• Refill the front differential with the correct viscosity and type of gear oil recommended for the model after completing the seal replacement; check for leaks once the system is pressurized.

Why Upgrade?

A worn front differential seal on Polaris ATVs and UTVs can allow gear oil to escape, inviting contamination and accelerating gear wear. Replacing with this kit restores an effective seal barrier, reducing leakage, preserving lubrication, and returning the front drivetrain to reliable operation under demanding trail or worksite conditions.