Can-Am Defender ball joints fail at the snap ring, and a machine built to work finds that weak point faster than a sport car does. Loaded beds, towing, and long days on rough ground put steady load through the front end, and that thin retaining clip is all that holds a factory joint in the A-arm. Keller ball joints remove it entirely — the two-piece housing threads into the arm like a nut and bolt. Hardened 4340 chromoly, greaseable, adjustable and rebuildable.
Todd Keller's original threaded design, covering every Defender from the HD5 through the HD11, two-seat and MAX, from 2016 to the current model year. The Defender uses a different joint in the upper and lower positions, so select the option for the position you are replacing.
Key Features
- Two-piece threaded housing eliminates the OEM snap ring
- 4340 hardened chromoly steel housings and studs
- Adjustable and greaseable for correct stud articulation over years of service
- Rebuildable — a worn joint is serviced, not replaced
- Robust boot retaining ring to keep water and mud out
- Covers HD5, HD7, HD8, HD9, HD10 and HD11, including every MAX
- Limited lifetime warranty against manufacturing defects
- Made in USA
Built To Solve: Can-Am Defender Ball Joint Pull-Out and Snap Ring Failure
- Snap ring shearing and letting the joint separate from the A-arm
- Clunking or knocking from the front end on rough ground and washboard
- Play in the wheel when rocked top-to-bottom on a jack
- Repeat joint failures on a machine that hauls, tows and works loaded
- Torn boots admitting water, mud and grit so the joint wears from the inside
- Downtime on a machine that has a job to do
Best For: Working And Big-Tire Can-Am Defender Machines
- Defender owners who work the machine rather than park it
- Ranch, property, farm and job-site use with a loaded bed or trailer
- Owners running larger tires or added lift
- MAX owners carrying more weight through the front end
- XMR and mud riders whose boots take a beating
- Anyone who has already replaced a factory joint more than once
If your A-arms are machined for oversized housings, the Defender Mega Keller joint is the stronger option and requires that modification.
Specifications
- Material: 4340 hardened chromoly steel, stud and housing
- Design: two-piece threaded housing, no snap ring
- Serviceability: adjustable, greaseable and rebuildable
- Boot: robust retaining ring to prevent water intrusion
- A-arm modification: not required
- Positions: upper and lower use different joints on this platform
- Warranty: limited lifetime against manufacturing defects, original purchaser
- Manufacturer Part Number: BJK-CA-X3U#BB (upper), BJK-CA-X3L#BB (lower), BJK-CA-X3U-K-2#BB (two uppers), BJK-CA-X3L-K-2#BB (two lowers), BJK-CA-X3-K-2#BB (upper and lower), BJK-CA-X3-K-4#BB (full front end)
Fitment
- Can-Am Defender HD5 and HD5 DPS: 2017-2021
- Can-Am Defender HD7 and HD7 DPS: 2022 onward
- Can-Am Defender HD8, HD8 DPS, HD8 XT and HD8 XT Cab: 2016-2021
- Can-Am Defender HD9, HD9 DPS, HD9 DPS Cab and HD9 XT: 2022 onward
- Can-Am Defender HD10 and all HD10 trims — 6x6, DPS, Limited, Mossy Oak, Pro, XMR, XT, XT Cab, XTP: 2016 onward
- Can-Am Defender HD11 Limited, HD11 XMR, HD11 XT and HD11 XT Cab: 2026 onward
- Can-Am Defender MAX HD7: 2022 onward
- Can-Am Defender MAX HD8, MAX HD8 DPS, MAX HD8 XT and MAX HD8 XT Cab: 2017-2021
- Can-Am Defender MAX HD9, MAX HD9 DPS and MAX HD9 XT: 2022 onward
- Can-Am Defender MAX HD10 and all MAX HD10 trims — DPS, Limited, Lone Star, XMR, XT, XT Cab: 2017 onward
- Can-Am Defender MAX HD11 and all MAX HD11 trims — Limited, Lone Star, Lone Star Cab, XMR, XT, XT Cab: 2026 onward
Trim level does not change the ball joint — a DPS, an XT and an XMR of the same HD tier all take the same part. Match your engine tier and model year. Fitment is not guaranteed on applications not listed above.
FAQ
Why do Can-Am Defender ball joints pull out of the A-arm?
The factory joint is retained by a snap ring seated in a groove. The steady load a working Defender puts through the front end can deform or shear that ring, and once it goes the joint has nothing holding it. Keller joints thread into the A-arm instead, so there is no clip to fail.
Does my trim level matter — DPS, XT, XMR, Limited?
No. Trim changes the equipment, not the front-end geometry. Order by your HD tier and model year, and the trim looks after itself.
Are the upper and lower joints different on the Defender?
Yes. Select Upper or Lower for the position you are replacing, take the pair for one corner, or the full front end for all four.
Do these fit the MAX?
Yes, every MAX from the MAX HD8 in 2017 through the MAX HD11 in 2026. The MAX carries more weight through the front end, which is exactly the case these were designed for.
Do Keller ball joints require A-arm modification?
Standard Keller joints do not — they thread into the factory arm as supplied. The Defender Mega version uses an oversized housing and does require machined A-arms, which is the main reason to pick one over the other.
Can these be rebuilt instead of replaced?
Yes. They grease and adjust, and the Keller ball joint rebuild kit for Can-Am services them with a new cup, boot and pin when the internals eventually wear — that kit has separate upper and lower options to match.
Why Keller
Todd Keller designed the two-piece threaded ball joint to fix the one part of a stock front end that keeps failing, and SuperATV now builds and backs the line. The design has barely changed because it does not need to: thread the housing in like a nut and bolt, use a chromoly stud, and make the whole assembly serviceable so a worn joint gets rebuilt rather than binned.
Keep Your Defender Working
Before ordering, confirm your HD tier and which position has failed — the full front end option covers all four corners and is the usual choice on a high-hour work machine. If the boots are torn but the joints are sound, the Keller boot replacement kit is the cheaper fix. If the joints are worn but the housings are good, the Keller rebuild kit for Can-Am services them. Tie rods and A-arm bushings are worth inspecting while everything is apart.
Installation Video
Official SuperATV installation walkthrough with Todd Keller: How To Install Keller Ball Joints
