Most cars have either 2 or 4 ball joints, and which number applies to your car depends entirely on the front suspension design — not the brand, not the year, the suspension type. Cars with MacPherson strut front suspension have 2 (one lower ball joint per side). Cars with double-wishbone or short-long-arm (SLA) suspension have 4 (one upper and one lower per side).
Count by Suspension Type
| Suspension Type | Ball Joints | Where | Typical Vehicles |
|---|---|---|---|
| MacPherson strut | 2 total (1 lower per side) | Lower control arm only — the strut itself replaces the upper ball joint's job | Most modern sedans, hatchbacks, compact and crossover SUVs |
| Double wishbone / SLA | 4 total (1 upper + 1 lower per side) | Upper and lower control arms | Trucks, larger SUVs, sports cars, many luxury sedans |
| Multi-link / 4WD / independent rear suspension | 4 to 8 total | Front upper/lower plus rear ball joints if the rear suspension is also independent | Heavy-duty trucks, AWD performance vehicles, vehicles with independent rear suspension |
The MacPherson-vs-wishbone split is the one that matters for almost every daily driver. The 4–8 range only shows up on vehicles where the rear suspension is also independent rather than a solid axle or a simpler multi-link setup without ball-and-socket joints — it's a real range, not a single number, because rear suspension design varies more between manufacturers than front suspension design does.
Does the Rear Have Ball Joints?
Usually not. Most rear suspensions — solid axles, torsion beams, simpler multi-link setups — locate the wheel with control arm bushings instead of ball joints, so the rear count is typically 0. Independent rear suspension (IRS), found on some performance and luxury vehicles, is the exception: it can add 2 to 4 more ball joints in the rear, using the same upper/lower logic as the front.
Why Your Manual Might List More "Ball Joints" Than This Article Does
If you look up your specific vehicle's parts diagram, you may see more items called out as ball-and-socket connections than the 2 or 4 this article counts. That's because tie rod ends and sway bar (stabilizer) links also use a ball-and-socket design internally — but the industry doesn't classify them as "ball joints." Tie rod ends connect the steering rack to the steering knuckle; sway bar links connect the stabilizer bar to the suspension. They wear and get diagnosed the same general way a ball joint does, but they're a separate parts category with their own replacement intervals. The count in this article is specifically the control-arm-to-steering-knuckle ball joints — if you're trying to reconcile a number from a parts catalog against what's written here, this is usually why the catalog number is higher.
Which One Wears Out First
On vehicles with both an upper and a lower ball joint, the lower one almost always wears first. In SLA/double-wishbone suspensions, the lower joint typically carries the vehicle's weight, which puts more continuous load on it than the upper joint sees. We cover exactly what the lower ball joint does and why that load matters in What Does the Lower Ball Joint Do?
Related reading: What Is a Ball Joint on a Car? · What Does the Lower Ball Joint Do? · What Is the Difference Between a Heim Joint and a Ball Joint?
