QA1 GM (K6145) Lower Press-In Style Ball Joint

Adjustable GM Press-In Ball Joint for Racing Applications

This QA1 lower press-in ball joint is a rebuildable suspension component for the verified GM and Pontiac applications below. Part 1210-109 is intended for hard-core racing use and is not for street use.

Key Features

• Press-in lower ball joint for selected GM and Pontiac suspension applications.
• The 1210-109 uses a precision-ground 52100 bearing steel race and self-lubricating components.
• Owner-rebuildable design with replaceable internal parts.
• Adjustable preload supports fine tuning of breakaway torque and roll-center setup.
• 64-degree misalignment angle supports demanding suspension geometry.
• Extended stud configuration with a 1/2-20 thread.
• Designed for hard-core racing use only, not street use.

Fitment

Specifications

What’s Included

• One QA1 1210-109 lower press-in ball joint assembly.
• Included components are limited to the ball joint assembly unless the selected package states otherwise.

About QA1

QA1 develops adjustable suspension components for motorsports and performance vehicles. The 1210-109 design uses rebuildable, self-lubricating construction so the suspension setup can be serviced and adjusted for racing use.

FAQ

Which vehicles use this lower ball joint?

It fits the Chevrolet, Pontiac, and GM applications shown in the Fitment table. Verify the vehicle year, model, trim, and suspension configuration before ordering.

Is this ball joint intended for street driving?

No. The verified installation documentation identifies this part for hard-core racing only and not for street use.

What type of installation does it require?

It is a press-in ball joint. The installer must confirm the receiving control arm and press-in bore dimensions before installation.

What is the stud thread size?

The stud uses a 1/2-20 thread with a 2:12 taper.

Can the preload be adjusted?

Yes. The adjustable design allows breakaway torque and suspension geometry to be fine tuned without removing the ball joint from the vehicle.

Can the assembly be rebuilt?

Yes. The design is owner rebuildable, and replacement internal parts are available for service.

What is the misalignment angle?

The verified specification is a 64-degree misalignment angle.

What does the package include?

The package includes one lower press-in ball joint assembly. Additional control-arm hardware or installation tools are not included unless specifically stated in the selected package.

What should be checked before ordering?

Confirm the application, press-in bore, stud clearance, thread, and racing-only use requirement before placing the order.

Installation Instructions

1. Confirm the vehicle application and compare the 1210-109 control-arm bore with the verified press-in dimensions.
2. Support the vehicle and remove the existing ball joint using a suitable press and approved service procedure.
3. Inspect the control arm for cracks, distortion, or damage before installing the replacement.
4. Press the ball joint squarely into the bore without striking the stud or forcing the assembly at an angle.
5. Confirm the stud taper, thread engagement, clearance, and preload adjustment before final suspension assembly.
6. Set the suspension geometry and breakaway torque for the intended racing setup.
7. Complete a professional inspection and recheck all fasteners before track use.

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.