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Hub Assembly 3QF-407-621-G
Available in stores 12 offers
Vehicle fitment 125 vehicles
Technical specifications
| OEM Part Number | 3QF407621G |
|---|---|
| Assembly Type | Integrated hub and bearing, pre-greased and sealed |
| Material | High-strength steel |
| Drivetrain | All-Wheel Drive (AWD) only |
| ABS Compatible | Yes — integrated tone ring |
| Axle Position | Front and/or Rear (model dependent) |
| Wheel Lug Nut Torque | 120–140 Nm (89–103 ft-lbs) |
| Hub Assembly Bolt Torque | See vehicle service manual |
| Dimensions | — |
How to replace the Hub Assembly
Replacing the 3QF407621G wheel hub and bearing assembly requires basic lifting equipment, wheel and brake component removal, and attention to correct torque values. Always consult the vehicle-specific service manual before beginning. The procedure below applies generally to VW Atlas and compatible AWD platforms.
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Prepare the Vehicle
Park on a level surface and engage the parking brake. Loosen the wheel lug nuts slightly while the vehicle weight is still on the ground. Raise the vehicle with a floor jack and secure it on rated jack stands before removing the wheel.
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Remove the Wheel
Fully remove the lug nuts and pull the wheel free. Set it aside in a safe location away from the work area.
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Remove Brake Caliper and Rotor
Unbolt the brake caliper and hang it from the coil spring or chassis using a hook or bungee cord — do not let it hang by the brake hose. Slide off the brake rotor and set it aside.
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Disconnect the ABS Sensor
Carefully unplug the ABS wheel speed sensor connector and release any wiring clips securing the harness near the hub area. Avoid pulling on the wiring itself.
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Unbolt and Remove the Old Hub Assembly
Remove the bolts securing the hub assembly to the steering knuckle or axle carrier. Note bolt count and pattern before removal. Extract the old assembly — use a hub puller if the unit is seized or corroded.
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Install the New Hub Assembly
Clean the mounting surface on the knuckle or carrier thoroughly. Position the new 3QF407621G assembly and hand-thread all bolts before torquing them evenly in a cross pattern to the specification listed in your service manual.
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Reconnect ABS Sensor and Reassemble Brakes
Plug the ABS sensor back in and re-secure any wiring clips. Reinstall the brake rotor followed by the brake caliper, torquing caliper bolts to specification.
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Reinstall the Wheel and Torque Lug Nuts
Mount the wheel, hand-thread the lug nuts, lower the vehicle, and torque the lug nuts to 120–140 Nm (89–103 ft-lbs) in a star pattern. Take a short test drive and verify no abnormal noises or warning lights remain.
Signs of a worn part
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Grinding or Humming Noise
A cyclic grinding, humming, or rumbling noise from the wheel area — often varying with vehicle speed — is one of the most common indicators of a failing wheel bearing within the hub assembly.
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ABS Warning Light Illuminated
A worn or damaged hub assembly can disrupt the integrated ABS tone ring signal, causing the ABS warning light or stability control warning to appear on the instrument cluster.
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Vibration in Steering Wheel or Cabin
Bearing wear introduces looseness and imbalance in the rotating assembly, which can transmit noticeable vibration through the steering wheel or vehicle floor, particularly at highway speeds.
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Excessive Wheel Play
Grabbing the wheel at 9 and 3 o'clock or 12 and 6 o'clock positions and feeling looseness or clunking movement indicates internal bearing play and requires immediate hub assembly inspection.
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Uneven Tire Wear
A failed hub assembly can allow slight changes in wheel alignment geometry, leading to abnormal or accelerated tire wear patterns that are not corrected by standard alignment adjustments.
Replacement intervals
Wheel hub and bearing assemblies are wear items without a manufacturer-defined replacement schedule. Inspect when any symptom of bearing wear is noted and replace promptly to prevent secondary damage to the knuckle, ABS system, or drivetrain.
Frequently asked questions
Is the 3QF407621G for the front axle, rear axle, or both?
The research indicates this assembly is listed as applicable to both front and rear axle positions, but fitment is model and configuration dependent. Always verify the axle position for your specific vehicle using your VIN at a VW dealer or parts supplier before ordering.
Will this part fit FWD variants of the VW Atlas or ID.4?
No. The 3QF407621G is engineered specifically for AWD drivetrain configurations. Front-wheel-drive variants use a different hub assembly and this part should not be installed on FWD applications.
My dealer quoted a different part number — is it still the same part?
Yes, likely. The 3QF407621G has been superseded by revision numbers including 3QF407621J, 3QF407621K, and 3QF407621N. Dealers and suppliers typically ship the current superseding revision, which is a direct replacement. Confirm the supersession chain with your dealer using your VIN.
Is LuK a reliable brand for this hub assembly?
Yes. LuK is part of the Schaeffler Group, which is a major OE supplier to Volkswagen Group. Their version of this hub assembly is built to OE specifications and is widely regarded as one of the best aftermarket alternatives to the dealer-sourced OEM part.
Do I need any special tools to replace this hub assembly?
In most cases you will need a floor jack, jack stands, a torque wrench, standard socket sets, and potentially a hub puller if the old assembly is corroded or seized in place. An OBD-II or VW-specific diagnostic scanner is recommended after installation to clear any ABS-related fault codes.
How do I know if I need to replace the hub assembly or just the wheel bearing?
On this design, the bearing is integrated and sealed within the hub assembly as a single non-serviceable unit. Individual bearing replacement is not supported — the entire hub and bearing assembly must be replaced when bearing wear or failure is detected.
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