PFA DB4 DB5 and DB6 Billet Alloy Steering Rack Assembly Complete LHD

Billet Alloy Steering Rack Assembly Complete (LHD) for Aston Martin DB4, DB5, DB6

Get better handling, stronger components, and total peace of mind with our complete LHD billet alloy steering rack assembly. We design and build these racks entirely in-house, utilising original factory parts wherever possible to maintain authentic heritage while upgrading critical structural components. We designed this heavy-duty unit for tough endurance rallies and classic Aston Martin restorations. As a result, it fixes the main weak spots found in original factory equipment. During our hands-on work preparing cars for endurance events like the Peking to Paris Rally, we found a major issue. Original cast Aston Martin steering racks often crack or fail under heavy stress. Furthermore, these original cast rack bodies frequently crack around the pinion end where the gaiter boot attaches, allowing harmful water and road grime ingress directly into the internal mechanism. Therefore, our complete LHD billet alloy steering rack assembly completely removes these structural failure points, offering exceptional safety and lasting reliability for your classic Aston Martin DB4, DB5, or DB6.

Product Overview

Original cast-alloy housings flex, twist, and crack under hard cornering loads. In addition, moisture and debris easily penetrate damaged cast housings at the pinion boot seal area, accelerating internal wear and gear binding. In contrast, our precision CNC-machined billet housing holds its shape under all driving conditions and permanently eliminates water and road grime ingress at the pinion end. Furthermore, because we assemble each unit in-house using original Aston Martin internal components where possible, you benefit from factory fitment combined with modern engineering integrity. While this specification details our Left-Hand Drive unit, we can also supply fully assembled Right-Hand Drive (RHD) steering rack units built to the exact same uncompromising standards for RHD chassis. So, owners and workshop specialists worldwide can install a ready-to-fit steering solution without compatibility issues. As a result, you get maximum safety, moisture protection, and crisp turning response. In addition, this complete design makes fitting simple for restorers and race teams alike.

Built for Better Performance & Steering Ratio Benefits

To significantly optimise driving dynamics, this complete assembly utilises the proven original late DB4, DB5, and early DB6 manual design geometry. Interestingly, the factory introduced this revised setup on late DB4 models to refine handling and steering effort. Because this setup gives a better steering ratio than the earlier, quicker DB4 rack, it noticeably reduces physical steering effort. At the same time, it gives you better road feel and control at higher speeds. Thus, you get a smoother, more confident drive on twisting roads or long trips.

To protect against rust and harsh weather, we finish every rack in a tough black powder coat. Before applying this final coat, we give each unit thorough surface prep and a zinc primer undercoat. Consequently, this two-layer finish stops rust and extends component life over decades of road or race use. Ultimately, we over-engineered every part of this assembly for maximum durability and safety. Thus, it represents a vital upgrade for fast road driving and serious motorsport use.

• Vehicle Fitment: Fits manual-steering classic Aston Martin models in both LHD and RHD chassis configurations:

  • Aston Martin early DB4, DB4GT & Zagato (delivers a highly desirable reduced-effort steering feel)

  • Aston Martin late DB4

  • Aston Martin DB5

  • Aston Martin DB6 & DB6 Mk2 (manual steering variants)

  • Note: This unit is NOT compatible with original factory hydraulic power steering systems.

• Great for Modern Upgrades: Serves as a strong, reliable base when integrating modern aftermarket Electric Power Steering (EPS) conversions.

• Essential for Rally Use: Proven under extreme conditions to ensure maximum driver safety, precise turn-in, and total structural peace of mind.

Technical Specifications for the Complete LHD Billet Alloy Steering Rack Assembly

Parts Book Reference

Cross-reference your original factory manuals using these details:

Key Features & Performance Benefits

• In-House Assembly: Expertly hand-built in our workshop using original Aston Martin components where possible to maintain authentic heritage.

• Peking to Paris Rally Proven: Developed directly from our real-world motorsport preparation experience to withstand the harshest rally environments on earth.

• Over-Engineered for Long Life: Replaces failure-prone original cast aluminium with solid billet alloy. Thus, it permanently eliminates casting cracks, bore ovality, and flexing.

• Sealed Against Water & Dirt: Specifically resolves common cracking around the pinion boot area, preventing water and road grime ingress from destroying internal bearings and gear teeth.

• Zinc-Primed & Powder-Coated: Built with clean surface prep, a zinc primer undercoat, and a durable black powder topcoat for complete corrosion protection.

• Better Steering Dynamics: Leverages the superior late DB4, DB5, and early DB6 ratio for clear road feedback and lighter physical steering effort on earlier DB4 models.

• Available for LHD & RHD: Fully assembled complete units supplied for both left-hand drive and right-hand drive chassis.

• Top Safety & Reliability: Gives you total structural confidence whether you are repairing a damaged original car or building a competition vehicle.

Need assistance with your steering rack conversion or power steering upgrade? We specialise in supplying authentic and precision-engineered components for classic Aston Martin models. If you need help verifying your pinion configuration, checking steering ratios, or selecting ancillaries, please contact our team for expert technical guidance.