Monoball kit, 2015-2021 S550 Mustang, GT350, Rear Only


SKU:  SBK-50-1000-R


CorteX Racing monoball kit for S550 Mustang and GT350 rear lower control arms. We replace the soft rubber bushings rear lower control arm forward mounting point for precision control and reduced hysteresis. See the video below.


This bushing location showed drastic deflection during on-track driving resulting in loss of performance. These bushings are essential for any dedicated track car and the best part NVH increase is minimal so we use them on our street cars as well!


Available on backorder


Monoball kit, Rear Only

Vehicles: 2015-2021 S550 Mustang, Shelby GT350, GT350R

CorteX Racing new monoball control arm kit for all 2015-2021 S550 Mustangs including GT350 and GT350R.


This upgrade is what we have done to our World Challenge race cars and now it is available for you to install on your vehicle for performance driving, track, or competitive racing.

What does this do for you?

Spherical bearings allow the arms to pivot in a smooth, and accurate motion as intended. No more deflection under loading, no more changing in toe which results in an inconsistent and nervous feeling on track!

The CorteX Racing monorails utilize American made high quality stainless ball with a Teflon lined race so you will have years of trouble free life from the bearings, just like our camber plates and sway bar end links.

Kits include:

  • mono ball housings
  • bearings,
  • retaining clips,
  • spacers, and
  • Loctite sleeve retainer

Instructions are available for download online. Bearings are pre-assembled in the housings before shipment to the user.

Also notice our optional OEM bushing removal mandrels available as an option.  They are perfectly sized to allow removal of the OEM bushings without damaging the control arms when using a press.


DIY Easy Install

This part can be installed at home if you have access to a press for removal of the OEM rubber bushings. If you don’t have access to a press we are more than happy to install them for you if you remove your control arms and ship them to us.  Call us for details or simply add the Cortex installation option before checking out!

LCA Bushing Deflection – In Action

Check out this undercar video of the rear lower control arm bushing deflecting from simply driving the car around the parking lot.


Additional information

Weight 7 lbs
Dimensions 10 × 10 × 4 in


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