Best OEM Replacement Gearcases for Polaris ACE

Looking for the best OEM replacement gearcases to keep your Polaris ACE running like new?
We’ve handpicked top-quality OEM options that deliver flawless fit, proven durability, and smooth performance for your ride.

Your Polaris ACE deserves the best. OEM replacement gearcases keep it running strong, just like new.

OEM parts offer unmatched reliability. They fit perfectly, just like factory originals. No guesswork, just smooth performance.

Choosing the right gearcase is crucial. These top picks are tested and proven. Your ACE stays tough, mile after mile.

List of Top 9 OEM Replacement Gearcases for Polaris ACE

Title	Best For	Price
Polaris OEM Main Gearcase Bellcrank for 2012-2019 ACE RZR 570 900 LE EFI EPS 3235397 3235386	This Polaris OEM Main Gearcase Bellcrank is perfect for anyone who owns a 2012-2019 Polaris RZR 570 or a 2016-2019 Polaris ACE 900. If you need a reliable replacement part that fits perfectly and keeps your ride smooth, this is the one for you.	View on Amazon (paid link)
OEM Factory Replacement Front Gearcase Differential Part#1337133 Fits Polaris RZR 570 800 900 Ranger 1000 Ace	This OEM Factory Replacement Front Gearcase Differential is perfect for Polaris RZR owners with models 570 (2012-2015), 800 (2012-2014), XP900 (2011-2014), or 900 (2017-2023). It ensures a direct fit and OEM quality for reliable performance.	View on Amazon (paid link)
Polaris OEM Gearcase Expansion Plug 2012-2017 Ranger RZR General Outlaw 3234249	This Polaris OEM Gearcase Expansion Plug is perfect for owners of 2012-2017 Polaris vehicles. It fits RZR, Ranger, Sportsman ACE, and General models, ensuring a reliable replacement for your ride.	View on Amazon (paid link)
All Balls Racing 25-2112 Differential Kit Compatible with/Replacement For Polaris ACE 500 2018, ACE 570 2018, ACE 900 EPS XC 2018	This product is perfect for Polaris ACE, General, Ranger, and RZR owners needing reliable differential repairs. Includes all bearings and seals for a complete fix, meets OEM specs, and comes with a 1-year warranty for peace of mind.	View on Amazon (paid link)
REPLACEMENTKITS.COM Brand Main Gearcase Triple Lip Oil Seal Fits Polaris ACE Sportsman Ranger RZR General Replaces 3234113	Perfect for Polaris ACE, Sportsman, Ranger, RZR, and General owners needing a reliable replacement for part 3234113. Triple lip oil seal ensures durability and a secure fit for smooth performance.	View on Amazon (paid link)
OEM Polaris Front Differential Geacase Part# 1334432 Fits RZR TURBO S, RS1, PRO XP 2020-2021+ [1334432] superseded part# 1337145/1337228	This OEM Polaris Front Differential Gearcase is perfect for off-road riders who want a reliable and brand-new replacement part. If you own a RZR Turbo S, RS1, or PRO XP from 2020-2021+, this fresh unit fits your ride perfectly. It’s great for those who want to keep their vehicle running smooth and strong without any guesswork.	View on Amazon (paid link)
Caltric Front Differential Gearcase Big Pinion Bearing Compatible with Polaris ACE 570 2016 2017 2018 2019	This product is perfect for Polaris vehicle owners needing a replacement front differential gearcase big pinion bearing. It fits Rzr Xp 1000 (2014-2019), Ranger Xp 900 (2013-2019), and other listed models. Always compare the part number (3235174) and dimensions (72.4mm OD, 28mm ID) to ensure compatibility.	View on Amazon (paid link)
Replacement Part Front Differential Gearcase Big Pinion Bearing for Polaris ACE 570 2016-2019	This product is perfect for Polaris ACE 570 owners (2016–2019) needing a durable, OEM-quality replacement. It ensures a precise fit, long-lasting performance, and preserves warranty coverage.	View on Amazon (paid link)
Replacement for Front Differential Gearcase Big Pinion Bearing for Polaris ACE 900 2016-2019 Mod-C26C-21117	This product is perfect for Polaris ACE 900 owners needing to repair or replace worn front differential gearcase big pinion bearings. It’s ideal for DIY mechanics or professionals seeking a durable, exact-fit solution that matches OEM specs and ensures reliable performance.	View on Amazon (paid link)

Detailed Reviews

Discover the best OEM replacement gearcases for your Polaris ACE with our expert-picked guide. Each part is chosen for perfect fit, durability, and smooth performance. Dive in to find the ideal gearcase that keeps your ride running strong and reliable.

1. Polaris OEM Main Gearcase Bellcrank for 2012-2019 ACE RZR 570 900 LE EFI EPS 3235397 3235386

The Polaris OEM Main Gearcase Bellcrank is a genuine part for your vehicle. It fits 2012-2019 RZR 570 and 2016-2019 ACE 900 models. Use it to replace OEM Part Number 3235397.

This part is built to last and works perfectly. It ensures smooth performance for your ride.

With Part Number 3235386, it’s easy to install. Trust this OEM Polaris product for reliability.

Pros	Cons
Genuine OEM Part – Perfect fit and reliable function. Replaces 3235397 – Easy direct swap upgrade. Fits Multiple Models – Works with RZR 570 and ACE 900. Durable OEM Build – Sturdy construction for tough conditions.	Limited fit for only specific Polaris models Not compatible with non-Polaris vehicles May require professional installation for best results

Perfect For:

This Polaris OEM Main Gearcase Bellcrank is perfect for anyone who owns a 2012-2019 Polaris RZR 570 or a 2016-2019 Polaris ACE 900. If you need a reliable replacement part that fits perfectly and keeps your ride smooth, this is the one for you.

Ready to Purchase?

View Price on Amazon (paid link)

2. OEM Factory Replacement Front Gearcase Differential Part#1337133 Fits Polaris RZR 570 800 900 Ranger 1000 Ace

Get your Polaris RZR rolling strong with this OEM Factory Replacement Front Gearcase Differential. It’s built to fit perfectly and perform reliably. No guesswork—just a precise match to your vehicle.

This part is made for the RZR 570 (2012-2015), RZR 800 (2012-2014), RZR XP900 (2011-2014), and RZR 900 (2017-2023) models. It’s an OEM part number 1337133, so it fits like the original.

Don’t settle for less. Keep your ride smooth and tough. This gearcase differential is the smart fix you need.

Pros	Cons
Perfect fit for Polaris RZR 570, 800, 900, and Ranger 1000. OEM quality ensures reliable performance and durability. Easy installation with factory-standard part number 1337133. Wide compatibility across multiple Polaris models and years.	Higher cost compared to aftermarket alternatives Limited model year compatibility (check exact fit) No warranty unless purchased through authorized dealers

Perfect For:

This OEM Factory Replacement Front Gearcase Differential is perfect for Polaris RZR owners with models 570 (2012-2015), 800 (2012-2014), XP900 (2011-2014), or 900 (2017-2023). It ensures a direct fit and OEM quality for reliable performance.

Ready to Purchase?

View Price on Amazon (paid link)

3. Polaris OEM Gearcase Expansion Plug 2012-2017 Ranger RZR General Outlaw 3234249

OEM Polaris part 3234249 is a gearcase expansion plug for select Ranger, RZR, General, and Sportsman ACE models from 2012–2017. It ensures a secure seal to protect vital components.

OEM reliability meets precise fit. Built to last in tough conditions. Compatible with multiple Polaris vehicles.

Easy installation for correct fit. Always use OEM parts for peak performance.

Pros	Cons
Exact fit for your Polaris vehicle, ensuring perfect compatibility. OEM quality guarantees durability and long-lasting performance. Easy installation saves you time and hassle. Trusted Polaris part for reliable gearcase protection.	Higher price than aftermarket options Potential leaks over prolonged use Limited compatibility with older models

Perfect For:

This Polaris OEM Gearcase Expansion Plug is perfect for owners of 2012-2017 Polaris vehicles. It fits RZR, Ranger, Sportsman ACE, and General models, ensuring a reliable replacement for your ride.

Ready to Purchase?

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4. All Balls Racing 25-2112 Differential Kit Compatible with/Replacement For Polaris ACE 500 2018, ACE 570 2018, ACE 900 EPS XC 2018

This kit fixes your differential with new bearings and seals. It works for many Polaris models, like ACE 500 and RZR 1000. Meets OEM specs for fit and long-lasting use.
1-year warranty covers replacements if needed. The kit is easy to install and built to last.
100% new parts ensure reliable performance. No generic parts—it’s made to match factory standards.

Pros	Cons
Complete kit with all bearings and seals included. Meets or exceeds OEM specs for perfect fit. Wide compatibility with many Polaris ACE and General models. 1-year warranty for worry-free purchase confidence. 100% new aftermarket parts built for lasting performance.	Not OEM, it’s an aftermarket product, may not fit perfectly. Limited warranty covers only one year after purchase. No installation tools included, requires extra effort.

Perfect For:

This product is perfect for Polaris ACE, General, Ranger, and RZR owners needing reliable differential repairs. Includes all bearings and seals for a complete fix, meets OEM specs, and comes with a 1-year warranty for peace of mind.

Ready to Purchase?

View Price on Amazon (paid link)

5. REPLACEMENTKITS.COM Brand Main Gearcase Triple Lip Oil Seal Fits Polaris ACE Sportsman Ranger RZR General Replaces 3234113

This oil seal replacement kit fits Polaris ACE, Sportsman, Ranger, RZR, and General models. It replaces part number 3234113 for easy upgrades or repairs. Triple lip design helps prevent leaks and keeps your gearcase running smoothly.

The kit is made by a trusted American owned company known for durable aftermarket parts. Every purchase comes with 100% Satisfaction GUARANTEED, ensuring quality you can rely on.

Check your model and year before buying to confirm fit. This seal is built to last, helping your vehicle perform better and longer.

Pros	Cons
Direct replacement for 3234113 Fits multiple Polaris models (ACE, Sportsman, Ranger, etc.) High-quality aftermarket part from American-owned brand 100% satisfaction guaranteed Durable, triple lip oil seal design	Potential aftermarket quality concerns vs OEM parts Compatibility check required for model/year fit Made-in-country not specified despite brand origin

Perfect For:

Perfect for Polaris ACE, Sportsman, Ranger, RZR, and General owners needing a reliable replacement for part 3234113. Triple lip oil seal ensures durability and a secure fit for smooth performance.

Ready to Purchase?

View Price on Amazon (paid link)

6. OEM Polaris Front Differential Geacase Part# 1334432 Fits RZR TURBO S, RS1, PRO XP 2020-2021+ [1334432] superseded part# 1337145/1337228

The OEM Polaris Front Differential Geacase is a brand-new, genuine part designed for top performance. It fits RZR Turbo S, RS1, and PRO XP models from 2020 to 2021 and newer.

This part replaces multiple older numbers, ensuring a perfect fit. It’s not rebuilt—it’s fresh from Polaris, ready to install.

Pros	Cons
Genuine OEM part ensures perfect fit and reliability. Brand new unit from Polaris, not rebuilt or used. Replaces multiple old part numbers for easy upgrades. Compatible with Turbo S, PRO XP, RS1 models 2020+. Direct replacement saves time, no extra modifications needed.	High price may deter budget-conscious buyers. Limited compatibility with older Polaris models. No installation tools included in the package.

Perfect For:

This OEM Polaris Front Differential Gearcase is perfect for off-road riders who want a reliable and brand-new replacement part. If you own a RZR Turbo S, RS1, or PRO XP from 2020-2021+, this fresh unit fits your ride perfectly. It’s great for those who want to keep their vehicle running smooth and strong without any guesswork.

Ready to Purchase?

View Price on Amazon (paid link)

7. Caltric Front Differential Gearcase Big Pinion Bearing Compatible with Polaris ACE 570 2016 2017 2018 2019

Get your Polaris running smooth with the Caltric Front Differential Gearcase Big Pinion Bearing. This part is built to fit perfectly and last long.

Fits many Polaris models. Easy to install. Comes with one bearing only.

Check the size carefully. Compare the picture to your old part. Make sure it matches before buying.

Pros	Cons
Wide compatibility with Polaris models 2014-2022 Exact OEM part number 3235174 for proper fit Precise dimensions ensure perfect installation Visual comparison tool aids accurate replacement 1x bearing included for easy replacement	Limited fit for specific Polaris models only Requires precise comparison to ensure correct replacement May need professional installation for best results

Perfect For:

This product is perfect for Polaris vehicle owners needing a replacement front differential gearcase big pinion bearing. It fits Rzr Xp 1000 (2014-2019), Ranger Xp 900 (2013-2019), and other listed models. Always compare the part number (3235174) and dimensions (72.4mm OD, 28mm ID) to ensure compatibility.

Ready to Purchase?

View Price on Amazon (paid link)

8. Replacement Part Front Differential Gearcase Big Pinion Bearing for Polaris ACE 570 2016-2019

Genuine OEM Quality ensures this front differential gearcase big pinion bearing matches the original Polaris ACE 570 design. Perfect Fit means it installs easily and works seamlessly with your vehicle’s system.

Strength and durability come from high-grade materials built to last under tough conditions. Preserve Warranty Coverage by using this OEM part, protecting your Polaris ACE 570 investment.

Dependable and trustworthy for reliable performance. Backed by the manufacturer’s approval. Ensures long-term confidence in your ride.

Pros	Cons
Genuine OEM Quality ensures reliable performance Perfect fit for seamless replacement Durable construction withstands heavy use Preserves warranty coverage when installed Manufacturer-backed reliability you can trust	Higher Cost compared to aftermarket alternatives. Limited Availability in local stores or online. Installation Expertise Required for proper fitting.

Perfect For:

This product is perfect for Polaris ACE 570 owners (2016–2019) needing a durable, OEM-quality replacement. It ensures a precise fit, long-lasting performance, and preserves warranty coverage.

Ready to Purchase?

View Price on Amazon (paid link)

9. Replacement for Front Differential Gearcase Big Pinion Bearing for Polaris ACE 900 2016-2019 Mod-C26C-21117

Replace your worn-out bearing with this direct replacement part. It’s made to match OEM specs for your Polaris ACE 900. Fits 2016-2019 models perfectly.

High-quality materials ensure durability and long life. No need for modifications—it’s engineered for a precise fit.

Ideal for repairs or restoration projects. Tested for reliability and compatibility. Get your Polaris running smoothly again.

Pros	Cons
Direct fit for Polaris ACE 900, no modifications needed. High-quality materials ensure long-lasting durability. Tested for reliability, guaranteed proper function. Ideal for repairs, saves time and hassle.	Limited compatibility with other vehicle models. No adjustable settings for performance tuning. Higher cost compared to generic alternatives.

Perfect For:

This product is perfect for Polaris ACE 900 owners needing to repair or replace worn front differential gearcase big pinion bearings. It’s ideal for DIY mechanics or professionals seeking a durable, exact-fit solution that matches OEM specs and ensures reliable performance.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Your Polaris ACE needs strong, reliable parts to stay tough on every ride. OEM gearcases keep it running smooth, just like the factory built it.

Compatibility: Match your model and year to the part. OEM parts fit perfectly, like 2012-2019 ACE 570/900 models. Check part numbers to avoid errors.
OEM vs. Aftermarket: OEM parts are factory-tested for fit and performance. Aftermarket options like All Balls Racing or Caltric meet OEM specs but cost less.
Durability: Look for built-to-last materials like reinforced seals or triple-lip oil seals. These handle rough trails and prevent leaks.
Ease of Installation: Some parts, like the gearcase expansion plug, are easy DIY fixes. Others may need a pro, so check skill level before buying.
Warranty: Choose parts with warranty coverage, like All Balls Racing’s 1-year guarantee. OEM parts often preserve your vehicle’s warranty.
Correct Part Numbers: Always cross-reference numbers like 3235397 or 1337133 with your manual. Wrong parts waste time and money.