Front Lower Control Arm Rear Thrust Monoball Joint | Audi - B9 | TGK Motorsport

Overview

Audi's front thrust arm bushings are a known weak spot, often prone to premature failure. The factory rubber bushings are designed to allow a fair amount of forward and backward wheel movement to absorb road impacts, providing a smooth and comfortable ride. While this helps deliver the luxurious feel Audi is known for, it also contributes to a disconnected, vague steering feel that many enthusiasts find lacking. Beyond comfort, the constant flexing of the rubber bushings also leads to issues over time—such as reduced handling, steering delays, wheel shimmy, braking delays, unwanted alignment shifts, and uneven tire wear. Aside from the fact they are rubber factory, they are also fluid filled, and once they crack and the fluid leaks out the life of the bushing is immensely diminished.

TGK Motorsport introduces its new Thrust Arm Spherical Monoballs! We designed this solution to deliver vastly improved durability over the OEM bushings, requiring no modifications and providing nearly instant response in cornering and braking for an enhanced driving experience. These monoballs feature a sealed OEM Lemforder ball joint known for its exceptional quality and longevity. The bearing assembly is precision CNC machined from 6061-T6 anodized aluminum with a knurled outer diameter for a perfect press fit and long-lasting durability. By using a sealed ball joint, We have achieved low-friction, no-bind suspension travel without unwanted deflection, resulting in superior steering precision, turn-in response, and direct braking feedback.

ATTN: Given the nature of the solid bushing and being press fit, measure the diameter of your arm before pressing the bushing in. OEM (and especially aftermarket) control arm hole diameters can vary pretty wildly. Interference of .002-.007” is ideal. Looser and they may knock around. Tighter and they may require extreme press forces and will be very likely to gall the mating surfaces during installation. If the interference is too high, you can lightly sand/file/ream the hole out until it’s in the correct range.

Details

Product specifications:

• Material: 6061-T6 Anodized Aluminum
• Ball Joint: OEM Lemforder Sealed
• Fitment: B9 A4/S4/RS4/A5/S5/RS5
• Installation: Press Fit - No Modifications Required
• Interference Fit: 0.002"-0.007" Ideal

Features and benefits:

• OEM Lemforder Ball Joint — Sealed design ensures exceptional quality and longevity with low-friction operation.
• Precision CNC Machined — 6061-T6 anodized aluminum construction with knurled outer diameter for perfect press fit.
• No Modifications Required — Direct OEM replacement design installs without any vehicle modifications.
• Superior Steering Precision — Eliminates rubber bushing deflection for immediate turn-in response and direct feedback.
• Enhanced Braking Response — No-bind suspension travel delivers direct braking feedback and eliminates delays.
• Eliminates Common Issues — Prevents wheel shimmy, alignment shifts, uneven tire wear, and premature bushing failure.

Fitment