SPL Parts Toyota A90/Z4 Solid Differential Mount Bushings

Rubber should be saved for the tires. The factory solid differential mount bushings on the Toyota GR Supra A90 and BMW Z4 G29 use soft rubber bushings that flex under load, which lets alignment and toe change right when you are asking the car to work the hardest. SPL Parts replaces those links with fully adjustable, spherical bearing components that keep the suspension honest and repeatable on both street and track.

Monoball bushings that do the job

These SPL Parts bushings replace the factory rubber with low friction spherical bearings housed in CNC machined aluminum shells. You get a direct connection between chassis and arm without the slop and spring effect of soft rubber, which improves feedback and keeps alignment where you set it.

Lock down the rear drivetrain

SPL solid differential mount bushings replace the soft factory mounts that let the rear diff wind up under load. Reducing that movement sharpens throttle response and helps protect driveline components when you launch or shift hard.

We use SPL hardware across many of our own builds because it is easy to work with, holds settings and stands up to real track mileage. If you are dialing in the Toyota GR Supra A90 and BMW Z4 G29 for serious driving, these pieces are a key part of getting the alignment and feedback you want.