A front diff does not usually give you much notice. You get a whine that was not there last month, or a clunk on engagement, or the front end simply stops pulling when you need it to — and then you are looking at the single most expensive component in the driveline of a Turbo R. Dealer pricing on a replacement is the part that makes people start pricing out used units of unknown history. The 4XPRO Front Differential that replaces Polaris OEM 1337158 and 1337227 is the direct-replacement route, at $1,099.99.
What it replaces
- Replaces OEM part numbers: 1337158, 1337227
- Price: $1,099.99
- Ships direct from 4XPRO's Florida warehouse
Those two OEM numbers are the whole job here. This is a complete front differential assembly, not a bearing and seal kit, so it is the fix when the housing or the gearset is the problem rather than just the seals.
Fitment
- 2022-2024 RZR Turbo R Premium / Sport / Ultimate
- 2022-2024 RZR Turbo R 4 Premium / Sport / Ultimate
- 2025 RZR Pro S Premium / Sport / Ultimate
- 2025 RZR Pro S4 Premium / Sport / Ultimate
Both the two-seat and four-seat versions are covered in each family, across all three trim levels.
Check the number on your diff first
This is the part of the listing that deserves a paragraph of its own, because 4XPRO flags it twice. Their instruction is direct: there may be different front differential options for your machine, so verify the model number off your differential matches the OEM numbers on the listing before purchasing. Polaris used several differential options across these model years, and a year-and-model match alone is not enough.
So before you order, get under the front end with a light and find the number cast or stamped on the housing. If it reads 1337158 or 1337227, you are in the right place. If it reads something else, stop and check with us rather than ordering on the strength of the model year. Five minutes with a flashlight is cheap compared to crating a differential back across the country.
Who it is for
This is a repair part, not an upgrade, and that is exactly the point. If your front diff is whining, leaking from a case half rather than a seal, or not engaging reliably, you are choosing between a dealer unit, a used unit with no history and no recourse, or a new direct-fit replacement with a warranty behind it. 4XPRO backs this one with their two-year fault-free warranty, which is the honest argument for buying new on a part this expensive.
One piece of advice while you have it apart: find out why the old one failed before you bolt in the new one. Front diffs on hard-driven cars usually die from a cause — a torn boot letting water and grit in, a chronically low fluid level, a breather hose that got submerged, or axles with worn splines putting load where it does not belong. Fix the cause, replace the axle seals and boots while access is easy, and get the fluid right. A new differential installed behind the same problem is a very expensive way to buy yourself one more season.
Order it at SxS Outpost
The 4XPRO Front Differential for the Polaris RZR Turbo R and Pro S is $1,099.99, replaces OEM 1337158 and 1337227, ships direct from 4XPRO's Florida warehouse, and is backed by 4XPRO's two-year fault-free warranty. Verify the number on your own differential against the listing before you order. See the rest of what fits in the Polaris RZR Turbo R collection, start in Polaris RZR Pro S if that is your car, compare parts across Differentials & Parts, or browse the full 4xPro lineup — and the differential is here.