Torque Solution Rear Differential BushingsTorque Solution Rear Differential Bushings Applications: Subaru WRX STi 2002 2007 Torque Solution continues to push the limits of high performance aftermarket products with our "NEW" Rear Differential Bushings.. These were designed to reduce movement of the rear differential. This helps to improve transmission feedback when shifting, and gives the car a more solid feel under hard acceleration. Developed to perform under the most extreme conditions,