Rear Differential Mount, Density Line, B2/B3 Audi UrQuattro, 4000, 80, 90, Coupe Quattro, Replaces 893 599 381



We're excited to announce the availability of our Track Density Performance Differential/Transmission Mounts for most early Audi applications, including the B3 Audi 80/90/Coupe Quattro, Audi UrQuattro, and Audi 4000 Quattro!

034Motorsport's Track Density Differential Mounts are the new standard in affordable drivetrain upgrades. Our mounts are redesigned with performance in mind, and manufactured from high-durometer rubber for increased performance and durability. Density Line Mounts are void-free, eliminating the slop associated with factory mounts.

Track Density:

The Track Density Differential Mount is manufactured from 80 durometer rubber, and is approximately 95% stiffer than stock.

The result is a locked-down drivetrain, solid shifting, and virtually no wheel hop. Track Density Mounts will cause a noticeable increase in noise, vibration, and harshness (NVH) inside of the cabin.


  • Manufactured from High Durometer Rubber
  • Reduced Drivetrain Slop
  • Decreased Differential Movement Under Load
  • More Direct Power Transfer
  • Improved Shifting Feel
  • Complete Drop-In Replacement of Factory Differential Mounts


  • B3 Audi 80/90/Coupe Quattro
  • Audi UrQuattro
  • Audi 4000 Quattro
  • 893 599 381 / 893599381

Mount simply needs to be pressed into the factory bracket for installation. NOTE - Audi made the rear cast diff housing brackets in two sizes, this bushing fits the larger size, cars with the smaller size bracket are .5mm diameter smaller than what is required for this mount and will need to be clearanced with sanding drum or hone