Bad Label Radius Arms Mounts with Castor Correction for Toyota Land Cruiser 80

Toyota Landcruiser 80 Radius Arms Enhancement

Enhancing the performance of the Toyota Landcruiser 80 is a key focus for me, particularly in achieving a balance between a low frame height and optimal up travel. Our approach is phased: starting with a 50mm lift to leverage the advantages of longer shocks and springs, followed by a 1″ body lift to create more space in the fender wells for bigger tires, with an end goal of fitting 37 or 38-inch tyres.

To address caster correction effectively with a modest 50mm lift, we've ingeniously modified the radius arm mounts on the frame side, lowering them by 50mm. This adjustment brings the caster and anti-dive angles back in line with the original factory settings. While searching for solutions, we came across a bolt-on option, but my preference leaned towards a more compact, weld-on method. We've also repositioned the axle forward to gain additional clearance near the firewall for larger tyre sizes.

This modification is critical as it repositions the wheel to the centre of its arc at ride height. This differs from standard lifted configurations where the rear pivot of the radius arm remains stationary relative to the frame, causing the axle centerline to be lower than the pivot when at rest. The tyre follows its original arc path in my setup, bringing it closer to the firewall at full compression. Therefore, advancing the axle forward is beneficial for extra clearance.

We've developed custom Radius Arm Mounts for the Toyota Landcruiser 80, lowering the frame end of the radius arms by 50 mm for an approximate 2″ lift and moving them 25mm forward for better tire-to-firewall clearance and an improved approach angle.

This relocation strategy effectively yields 3.45 degrees of caster correction. Opting for a weld-on design, I've included a reinforcing rib into the rear of the factory mount, enlarging the weld area and merging everything into a unified structure. This design ensures the mounts are as streamlined as possible, preventing any obstacles the arm might encounter.

Despite being weld-on mounts, they do not conceal the original hole, allowing for potential future modifications. If needed, the lower part can be removed while maintaining a reinforced factory mount.

Additional Insights:

With a 2″ suspension lift, 1′ body lift, and prototype 30mm Radius Arm Mounts (RAMs), the front axle of the Toyota Landcruiser 80 is shifted 25mm forward, improving firewall clearance for larger tyres, though some fender trimming might be required for exceptionally large sizes.

We recommend using an old or spare radius arm bushing as a spacer to secure the factory mount during the RAMs' welding process, ensuring proper alignment and stability.

The bending process for these mounts can be intricate, often resulting in one side being slightly over-bent. It's advisable to tack and secure the side with the correct angle to the factory mount first, ensuring proper bushing clearance before adjusting the other side.