Model 3/Y: lower ball joints — diagnosis, repair options, brands

Summary

On M3/Y the front lower assembly has two ball joints — one on the "short" front arm (compression link), the other on the "camber" arm (rear lower). When the boot cracks and grease leaks out, the joint starts to squeak/crunch similarly to the upper ball joint. It happens over bumps, when turning the steering wheel, at low speed. The lower ball joint itself lasts longer than the upper — but if it has already started leaking, don't run it to seizure and wheel misalignment.

Symptoms / Diagnosis

• Crunch/click over bumps and when "jumping" over a speed bump — especially when the car "unloads" after the bump.
• Squeak when turning the steering wheel in circles while parked (but in 80% of cases this is the upper joint first — rule that out first).
• On a lifted wheel — play when rocking in the 6/12 plane (sometimes already visible on the boot — torn/cracked).
• Sometimes pulls to the side or the car "floats" on ruts — related to a settled geometry.
• On a heavily worn lower joint — a clicking "clack" in low-speed turns.

What to do

1. Diagnosis. Lift the car, remove the wheel. Use a pry bar to rock the arm up-down and side-to-side from the hub — play in the ball joint is felt right away. At the same time inspect the boot for cracks/leaks. If the boot is intact and grease hasn't leaked — likely not it. Don't confuse with the upper ball joint (FUCA): if there's a squeak — first check the "horseshoe" up top, in 90% of cases that's the culprit (see the separate article on the upper arm).

2. Repair options.

   a) Replace the entire arm as an assembly (Tesla way). The ball joint is press-fit into the cast aluminum arm — Tesla officially does not replace the ball joint separately. Pros: "factory-fresh," torqued bolts, guaranteed fit. Cons: higher price, the arm comes as an assembly with bushings (overpaying if those are still good).

   b) Replace just the ball joint, keeping the arm. Careful shops in Belarus press out the old ball joint and press in aftermarket replacements (e.g., units from Lemforder, Moog, CTR, sometimes — updated post-Tesla TSB). Pros: about half the cost, you don't toss an arm with healthy bushings. Cons: requires a press and experience, otherwise you can "bell-mouth" the seat in the aluminum.

   c) Aftermarket arm assembly. The market is full of "Chinese" options (A-Premium, MOTORMAN, etc.) and decent aftermarket options from Teknorot, Mevotech, Delphi. Some are fully OEM-compatible, some are a lottery.

3. Parts selection. Part numbers I've seen in catalogs:

   • 1044341-00-x — front lower arm (compression link), Model 3.
   • 1044359-00-x — front lower rear position (with camber ball joint), Model 3.
   • 1188341-00-C — front lower forward, Model Y (verify by VIN). Brands the market trusts: Lemforder, Moog, SKF, Teknorot, Delphi, Mevotech. From "Tesla-specific" — EVANNEX, A-Premium (but A-Premium quality is variable).

4. AliExpress note. AliExpress is full of "kits of 4 arms for $200" — that's a lottery. I've seen 100% of cases in chat where such a kit arrived with mounting dimensions "give or take a millimeter," squeaked after 10,000 km, or developed ball joint play within a season. Take only a proven brand (Lemforder/Moog/Teknorot) and preferably from a dealer or Tesla-specialty shop (EVANNEX, EV Parts Online), not from no-name sellers.

Belarus budget

Parts (per arm):

• Tesla OEM: ~$180–260
• Lemforder/Moog/Teknorot: ~$90–150
• Ball joint only (for press): ~$25–60
• AliExpress "kit" (at your own risk): ~$40–70 per arm

Labor (Minsk shop labor ≈ $50/h):

• Press-replace one ball joint: ~2 h × $50 = $100
• Replace arm assembly: ~1.5 h × $50 = $75
• Both sides at once — ~3.5 h ≈ $175

Total for one side (parts + labor):

• Press ball joint replacement: ≈ $125–160
• Arm replacement with branded aftermarket: ≈ $165–225
• Tesla OEM: ≈ $260–340

After replacement alignment is mandatory — another ~$50–80.

DIY notes

General-level (not step-by-step, but enough to decide whether to DIY or go to a shop):

• Remove the wheel, unbolt the brake caliper (hang from a wire, don't yank the hose).
• Unbolt the sway bar end link (often seizes; hold with a second wrench on the flats).
• Unbolt the ball joint from the steering knuckle (sometimes — with a puller, to avoid "mangling" the threads).
• Unbolt the arm from the subframe (long bolts, torque 115 Nm on the subframe side per Tesla manual).
• On M3 the lower rear (camber) arm — with a camber eccentric: before unbolting, mark the position!
• Before final torque, load the wheel (compress the spring) — otherwise bushings will be over-tensioned.
• Often (NOT ALWAYS — every Tesla is different): disconnecting the 12V battery before suspension work isn't critical, but if you plan to change ABS sensors / level sensors — better to disconnect.
• After — mandatory alignment and suspension calibration in Service Mode (if the car has active suspension/CCD).

Links / Sources

• MPP — diagnosing all M3/Y noises, including lower ball joints
• TMC: Another bad ball joint after 43,000 miles
• Tesla Service Manual — Control Arm Lower (M3/Y)
• EVANNEX — front lower arm 1188341-00-C for Model Y
• Motronix — guide on M3/Y arm failures
• YouTube: EVANNEX Front Control Arm DIY For Tesla Model 3 and Model Y

Community experience

Search through the archive of the TESLA owner's group BELARUS chat — lower ball joints come up often, usually as "well, also check the lower one" once the upper one is ruled out.

Additional observations from chat:

1. First the upper, then the lower. In 90% of M3/Y cases the upper "horseshoe" is the squeaker. The lower is checked when the noise persists after replacing the upper or after an ATF injection. Quote (Pasha n1claus): "on my Three, when both regular and floating bushings were tired — it would wander on the road." Suspension noise is usually from the top, but not always.
2. The short lower arm also fails. Nick: "I had the short lower arm, the boot was completely shredded and there was nowhere left to pack grease — so you have to look anyway, it doesn't always squeak from above." The boot dies first.
3. Grease syringe trick works on the lower one too. Same technique: ATF/grease via a thin needle under the edge of the boot. The noise goes away for a season or two, but it's temporary.
4. Bushings on the lower "camber" arm often fail before the ball joint. If they're visibly bad — replacing the arm as an assembly is more justified than chasing just the ball joint.
5. "OEM is also China." Quote: "New OEM is 260 and there's no guarantee it will last better than China. + There's no guarantee that 'OEM' isn't China either." — chat has discussed multiple times that Tesla OEM arms are made at the same Asian factories. But Tesla's QC is stricter than a no-name Chinese supplier.

Who reported the issue: Paul, Nikita, Alexey, Pasha n1claus, Denis

Who found the fix: Pasha n1claus, fl, Alex Bor, Nick, Alexey m3 Highland/cn

Discussion in Telegram: #86807, #194622, #250523, #281451, #324536, #342391, #400145