SPL Parts Rear Lower Camber Arms - 2013-2022+ Toyota 86 / GR86 / FRS / Subaru BRZ / WRX / STI

Looking to dial in alignment perfectly, not deal with suspension geometry deflection, and have all the adjustability you'd ever want in the rear end of your GR86 / 86 / BRZ / FRS / WRX & STI?

SPL adjustable Rear Lower Camber Arms (RLL) allow for adjustable camber, track, and installed motion ratios while significantly reducing unwanted dynamic alignment change and binding that occurs with rubber or polyurethane bushings during hard driving. 

The lower arm also handles the forces transmitted through the springs, shocks, and sway bar. By increasing the strength (rigidity) of the arm and using a spherical the rear suspension will have improved response, better lateral grip, and provide clearer feedback to the driver.

Key Features:

• Large Range of Camber and Motion Ratio Adjustability
• Lightweight: 3.57 lbs (1.62 kg) per Arm (17% Lighter than OEM)
• Eliminates Camber Loss to Bushing Deflection
• Improves Suspension Response and Driving Feel
• Easier, On-Car Adjustment + No Jam Nuts
• Self-Cleaning, US Made, PTFE-Lined FK Bearings

Adjustable Motion Ratios

The three position mounting holes for the sway bar endlinks and shock mount allow you to adjust the mounting points to prevent endlink binding and quickly adjust motion ratios to change spring and sway bar effectiveness. Simply put, it's like having adjustable spring rates without a spring replacement. For example, a 6.0 kg/mm (336 lbs/in) main spring could act as a 6.8 (380 lbs/in), 6.0, or 5.2 kg/mm (294 lbs/in) spring, giving +/- 13% of adjustability. Likewise the sway bar endlink can be installed to act like a 0.5mm larger or smaller bar, so an 18mm bar would act like an 18.5mm, 18.0mm, or 17.5mm bar depending on setup (endlink geometry permitting).

Unrivaled Adjustability Range

The large-diameter chromoly double adjuster and 5/8" (15.8mm) rod end allows for up to 1.375" (35mm) of total length adjustment, a 50% increase compared to many other options on the market.

Materials

• 6061-T6 Aluminum Arms (Anodized Black)
• 6061-T6 Aluminum Spacers and 360º Clamps
• 4130 Chromoly Steel Double Adjuster (Electroless Nickel Plated)
• Ti-6Al-4V Titanium 1/4-20 Socket Head Allen Screws (Anodized Blue)

Easy, On-Car Adjustments

Instead of jam nuts, the SPL rear lower arms feature 360° clamps and an electroless nickel plated double adjuster to make setting the camber angle significantly easier. Simply loosen the 1/4"-20 titanium hardware and turn the double adjuster to achieve the desired amount of camber. Lastly, tighten the 1/4"-20 titanium hardware to lock it in. No more wandering alignment specs as you try to hold one end and tighten the other.

Noise, Vibration, and Harshness (NVH)

The rear lower control arm is not a significant source of perceived NVH. In fact, it's more and more common for OEMs to use spherical in the knuckle bushing where the lower control arm mounts. The spherical rod end eliminates torsional bushing bind, resulting in a small improvement to ride quality, but may transmit a small amount of additional road noise over textured/grooved pavement.

Replaces OEM Part Numbers

This is a list of known OEM part numbers. OEMs constantly make changes to part numbers due to part updates, suppliers, etc so this may not be a complete list.

Toyota:
SU003-08417
SU003-04490

Subaru:
20250-AL011
20250-FG042
20250-AJ040
20250-CA010

Install Instructions:

SPL 86/BRZ/WRX Rear Lower Arms Install Instructions