Important: this rear axle is designed to work only with the manufacturer's 6" Big Lift Kit for the Polaris RZR XP Turbo S and XP 4 Turbo S. It is longer than stock to match that lift, so it will not fit a stock-height machine or another brand's lift. For a lifted Turbo S on big tires, the X300 brings a high-tech answer to broken axles: a 300M alloy shaft that flexes under shock loads instead of snapping, paired with oversized chromoly CVs and the longest warranty in the axle business.
Highlights
- Extended length built only for the manufacturer's 6" Turbo S Big Lift Kit
- 300M alloy steel flex shaft that twists to absorb impact, then returns
- CV components made of 300M and 4340 alloy steel
- Maximized CV, spider and cage size for strength
- Reduces strain on CVs, differential and other drivetrain parts
- CVs packed with proprietary high-temperature grease
- 3-year manufacturer warranty, the best axle warranty in the industry
Why the Flex Matters
Most axles survive hits by being stiff, and when the load is too big, something breaks. The X300 works differently. When a torque spike hits that would break other axles, the 300M shaft twists until the load passes, then springs back to its original shape. That engineered flex soaks up much of the stress that would otherwise slam into your CVs and differential. The result is less wear and fewer broken parts in the expensive pieces of your drivetrain.
What 300M Brings
300M is an aircraft-grade alloy steel chosen for its high strength, higher silicon content and added vanadium. Those properties, combined with the X300's shaft design, make the signature flex possible without giving up toughness. The CVs use 300M and 4340 alloy with oversized internals, so the joints are as strong as the shaft.
Made for Big Tires and Hard Riding
A 6-inch lift with large tires puts serious loads through the rear axles every time you land, climb or hook up in mud. If you're the kind of rider who breaks everything bolted to the machine, the X300 is built for you. Its ability to give a little under shock lets you run bigger tires and ride harder with less downtime.
X300 or Rhino 2.0?
Both big-lift axles fit the same 6" lift. The Rhino 2.0 is the budget-friendly rigid chromoly option with an 18-month warranty. The X300 costs more but adds the 300M flex shaft that protects the rest of the drivetrain, plus a 3-year warranty. For the hardest-hitting lifted builds, the X300 is the step up.
3-Year Warranty
The X300 is backed by a 3-year manufacturer warranty, the industry's best for any axle, which shows how confident the maker is in this design.
What's in the Box
- (1) X300 Big Lift Kit rear axle (sold individually)
Who It's For and What Pairs Well
For RZR XP Turbo S and XP 4 Turbo S owners running the manufacturer's 6" Big Lift Kit who want maximum drivetrain protection. Browse more RZR Turbo S axles and CVs, and see RZR Turbo S lift kits and RZR Turbo S drivetrain parts.
Fitment
| Year | Make | Model |
|---|---|---|
| 2018-2021 | Polaris | RZR XP Turbo S |
| 2019-2021 | Polaris | RZR XP 4 Turbo S |
Installation Notes
Install only on a Turbo S fitted with the manufacturer's 6" Big Lift Kit; it will not fit stock suspension. Support the machine safely, remove the stock rear axle, install the X300, torque the hub nut and hardware to spec, and cycle the suspension to check boot clearance.
- source:
- superatv
- satv_url:
- https://www.superatv.com/polaris-rzr-xp-turbo-s-big-lift-kit-heavy-duty-axles-x300
- fitment_raw:
- Polaris RZR XP Turbo S 2018-2021; Polaris RZR XP 4 Turbo S 2019-2021
- desc_status:
- rewritten_2026-10-26
- sub_brand:
- X300 Axles
