GPM Racing Aluminium Front Knuckle Arms-32pcs Set for Traxxas 1/10 TRX4 (TRX4021)

Precision CNC Machined Knuckle Inners for TRX4

This technical inner knuckle arm set is produced for TRAXXAS TRX4 Trail Crawler platforms to support steering geometry and ensure correct engagement of internal knuckle gears. Components are CNC machined from 6061 T6 aluminium and finished with a 3D streamlined process to provide close dimensional control and a predictable metal-to-metal interface for upgraded durability.

The assembly includes inner knuckle parts and stainless steel fasteners intended as a replacement for factory plastic components where enhanced stiffness and wear resistance are required. Consult manual numbers 8252 and 8251 for correct part orientation and service matching during fitment.

From a tuning perspective, these aluminium inners reduce deflection in the steering assembly and will influence front pinion and spur alignment. After installation, set and verify gear mesh, axle geometry, and wheel alignment to maintain reliable gear engagement and consistent steering response on technical terrain.

Specifications

• Item: Aluminium front knuckles inner part set, includes hardware and fasteners as listed in product notes.
• Material: Aluminium 6061 T6, CNC machined.
• Model Number: TRX4021
• Compatibility: for TRAXXAS TRX4 TRAIL CRAWLER

Specify these CNC machined inners for precision upgrades where dimensional accuracy and reduced assembly flex are priorities in trail and crawler setups.

This item is compatible with

• TRAXXAS TRX4 Defender Trail Crawler

What tolerances should I expect from the CNC finish?

The 3D CNC finishing process delivers consistent mating surfaces and close dimensional control to aid repeatable alignment; inspect mating faces and fastener holes during test fitting.

Will aluminium inners affect gear backlash?

By reducing component flex, aluminium inners can change how backlash feels; recheck pinion to spur mesh and adjust as needed to maintain smooth engagement.

Which manual numbers are relevant for service checks?

Use manual numbers 8252 and 8251 as references to confirm orientation and to locate matching service parts during installation and maintenance.

Do these parts require any special installation procedure?

Standard fitting practices apply; ensure fasteners are correctly torqued, verify gear mesh and axle geometry, and perform a functional check of steering travel before full use. Write Product Review Please sign in your account before you can write any review. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM’s factory, so please allow around 14 days for dispatch.