If you keep blowing ball joints on your RZR XP 900, the weak link is often the snap ring that holds a factory-style joint in the A-arm. Keller ball joints for the Polaris RZR XP 900 and XP 4 900 get rid of the snap ring completely, using a two-piece threaded design that clamps the arm like a nut and bolt, so the joint can't work its way out.
Highlights
- Two-piece threaded design, no snap ring
- 4340 hardened chromoly steel
- Adjustable, rebuildable and greaseable
- Robust boot retaining ring keeps water out
- Sold as 1, 2 or 4 ball joints
How the Two-Piece Design Works
You press the joint into the A-arm, then thread the housing onto the back. The two pieces pinch the arm between them, making it virtually impossible for the joint to pull out by accident, even under hard hits and heavy loads.
Built for Heavy Machines and Big Tires
Whether you run stock tires or massive mud tires, extra weight and leverage are hard on ball joints. Hardened chromoly and a retention method that doesn't rely on a thin ring let you push harder and add accessories without stopping to fix blown joints on the trail.
Made to Last
Because they're greaseable, adjustable and rebuildable, you can take up wear and keep them running like new instead of throwing them away when they get loose.
How Many Do You Need?
- 1: replace a single failed joint
- 2: do one side or one pair of arms
- 4: replace the whole front end at once
Fitment
| Year | Make | Model |
|---|---|---|
| 2011-2014 | Polaris | RZR XP 900 |
| 2012-2014 | Polaris | RZR XP 4 900 |
What's in the Box
- Keller ball joints in the quantity you choose
Who It's For and What Pairs Well
For RZR XP 900 and XP 4 900 owners who ride hard, run big tires or are tired of replacing joints. Pair them with A-arm bushings and A-arms from RZR XP 900 suspension parts.
Installation Notes
A ball joint press is needed to install the joint before threading on the housing. Grease the joints after installation and regularly after wet or muddy rides. Instructions are linked below.
- source:
- superatv
- satv_url:
- https://www.superatv.com/polaris-rzr-xp-900-keller-ball-joint
- fitment_raw:
- Polaris RZR XP 900 2011-2014; Polaris RZR XP 4 900 2012-2014
- install_pdf:
- https://madmin.superatv.com/amfile/file/download/file/7525/product/62963/
- desc_status:
- rewritten_2026-10-28
- sub_brand:
- Keller Performance Products
