Kawasaki Mule Pro ball joints fail at the snap ring, not the joint itself. That thin clip is the only thing holding a factory joint in the A-arm, and a machine that tows, plows and carries a loaded bed every day finds it. 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.
These fit the upper A-arms only. SuperATV lists this Keller joint for the upper position across the Mule Pro range — DX, DXT, FX, FXT, FXR and the FXT Ranch Edition.
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
- Fits the upper A-arms only
- Covers Mule Pro-DX, DXT, FX, FXT, FXR and FXT Ranch Edition
- Limited lifetime warranty against manufacturing defects
- Made in USA
Built To Solve: Mule Pro Upper Ball Joint Pull-Out and Snap Ring Failure
- Snap ring shearing and letting the upper joint separate from the A-arm
- Clunking or knocking from the front end on rutted job sites and pasture two-track
- Play in the wheel when rocked top-to-bottom on a jack
- Repeat failures on a Mule that tows, plows or runs a loaded bed daily
- Torn boots admitting water, mud and grit so the joint wears from the inside
- Replacing the same upper joint often enough that it has become routine maintenance
Best For: Hard-Working Kawasaki Mule Pro Ranch and Job-Site Machines
- Mule Pro-FXT and DXT owners running crew cabs with weight over the front end
- Ranch and farm machines working mud, snow and standing water year round
- Mule Pro-FXR owners riding the sportier chassis harder than a utility pace
- Owners who have already replaced an OEM upper joint and do not want to do it again
- Anyone who wants a serviceable joint rather than another disposable one
Because this listing covers the upper position only, a full front-end refresh will still need lower joints sourced separately.
Specifications
- Material: 4340 hardened chromoly steel, stud and housing
- Design: two-piece threaded housing, no snap ring
- Serviceability: adjustable, greaseable and rebuildable
- A-arm modification: not required
- Position: upper A-arms only
- Warranty: limited lifetime against manufacturing defects, original purchaser
- Manufacturer Part Number: BJK-K-TUL#AQ (one joint), BJK-K-TUL-K-2#AQ (two joints)
Fitment
- Kawasaki Mule Pro-DX: 2016 onward
- Kawasaki Mule Pro-DXT: 2016 onward
- Kawasaki Mule Pro-FXT: 2015 onward
- Kawasaki Mule Pro-FX: 2016 onward
- Kawasaki Mule Pro-FXR: 2018 onward
- Kawasaki Mule Pro FXT Ranch Edition: 2016 onward
Fits upper A-arms only. Each Mule Pro variant enters the range in a different year, so check yours against the list. Fitment is not guaranteed on applications not listed above.
FAQ
Why do Mule Pro ball joints pull out of the A-arm?
The factory joint is retained by a snap ring seated in a groove. Towing, plowing and a loaded bed all push load through that clip, and once it deforms or shears the joint has nothing holding it. Keller joints thread into the A-arm instead, so there is no clip to fail.
Do these fit the lower A-arms as well?
No. SuperATV lists this Keller joint for the upper position only on the Mule Pro. If you are rebuilding a complete front end you will need lower joints from another source.
Which Mule Pro models are covered?
Mule Pro-DX, DXT, FX, FXT, FXR and the FXT Ranch Edition. Start years differ — the FXT runs from 2015, most others from 2016 and the FXR from 2018.
Does this fit both the 812cc and 1000cc Mule Pro engines?
SuperATV lists the Mule Pro by model family rather than by engine, so the FX and FXT coverage spans both displacement versions of those machines. Check your model designation against the fitment list.
Do Keller ball joints require A-arm modification?
Standard Keller joints do not — they thread into the factory arm as supplied. The 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 Kawasaki services them with a new cup, boot and pin when the internals eventually wear.
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 Mule Pro Front End Working
Before ordering, confirm your Mule Pro variant and year, and note that this listing covers the upper A-arms only — two joints does one axle's worth of uppers. 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 Kawasaki services them. On a working machine, 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
