Assault Industries Polaris RZR Pro XP Phoenix Axles (2020+)
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Assault Industries MAS-223 Phoenix Axles are stock-length front and rear replacement axles for the 2020+ Polaris RZR Pro XP and Pro XP 4. They pair heat-treated 4340 chromoly shafts, larger than stock, with Assault's proprietary high-temp grease, which showed no breakdown at 586.4°F in lab testing.
Choose Front or Rear. Each axle is sold individually.
These RZR Pro XP axles are for owners who push the Pro XP hard. Pro XP axles here come as a Pro XP front axle or RZR Pro XP rear axle, and the same parts serve as RZR Pro XP 4 axles. Shoppers comparing Polaris Pro XP axles or Polaris RZR Pro XP axles can order one RZR Pro XP axle or both. These are the Phoenix axles RZR Pro XP riders choose for heat, the Assault Industries Phoenix axle for the Pro XP.
Key Features
- Proprietary high-temp grease blend, virtually waterproof
- Grease resists temperatures above 586.4°F (308°C)
- Reduced friction prevents heat buildup
- High pressure tolerance for extreme rides
- Heat-treated 4340 chromoly shafts, larger than stock
- Operates at high CV angles
- Field and lab tested; 3-year warranty
Built To Solve: Overheated CVs on a Polaris RZR Pro XP
- CV joints failing when stock grease overheats
- Boot and CV failures after long, fast pulls
- Stock shafts bending on rocks and logs
- Replacing a broken axle with another stock part
Best For: 2020+ Polaris RZR Pro XP and Pro XP 4 Owners
- 2020+ RZR Pro XP owners
- 2020+ RZR Pro XP 4 owners
- Dune and desert riders who run at speed
- Owners replacing a front or rear axle
Specifications
- Brand: Assault Industries
- Product line: MAS-223 Phoenix Axle
- Shaft: heat-treated 4340 chromoly steel, larger than stock
- Grease: proprietary high-temp blend, tested to 586.4°F (308°C)
- Warranty: 3 years
- Length: stock
- Positions: front, rear
- Sold: individually
- Replaces OEM: 1334388, 1334389, 1336922, 2208421
- Manufacturer Part Number (front): AXRS-1-86-F-0-DT
- Manufacturer Part Number (rear): AXRS-1-86-R-0-BT
Fitment
- Polaris RZR Pro XP: 2020+
- Polaris RZR Pro XP 4: 2020+
Replaces OEM 1334388, 1334389, 1336922, 2208421. These are stock-length axles; lifted or long travel Pro XPs need the axles matched to that kit. Fitment is not guaranteed on applications not listed above; confirm your year, model and cab before ordering.
FAQ
Do they fit the Pro XP 4?
Yes. SuperATV lists the 2020+ RZR Pro XP and Pro XP 4.
Will they work with a lift or long travel kit?
These are stock-length axles. See our Rhino 2.0 Pro XP lift kit and long travel axle listings for those setups.
Which OEM part numbers do they replace?
SuperATV lists OEM 1334388, 1334389, 1336922 and 2208421.
What makes the Phoenix grease different?
Assault Industries uses a proprietary high-temp grease blend that is virtually waterproof. In lab testing it showed no breakdown at 586.4°F (308°C), the limit of the test equipment, while OEM grease broke down at 365°F.
How do they compare to SuperATV Rhino 2.0 axles?
Both use heat-treated 4340 chromoly. The Phoenix Axle adds Assault's high-temp grease and a 3-year warranty, versus 18 months on Rhino 2.0; Rhino 2.0 costs less. See our Rhino 2.0 listing for the RZR Pro XP.
What warranty do they carry?
Assault Industries backs MAS-223 Phoenix Axles with a 3-year warranty.
Why Assault Industries
Assault Industries built the MAS-223 Phoenix Axle around its own high-temperature grease. In Assault's viscosity lab testing the grease showed no breakdown at 586.4°F, where the test equipment maxed out; OEM grease broke down at 365°F. Every MAS-223 Phoenix Axle is backed by a 3-year warranty.
Complete Your RZR Pro XP Driveline
When one Pro XP axle fails, the others have usually seen the same heat and abuse, so decide which positions you need. Confirm your model, year and option against the fitment list.
