Torque Solution Rear Differential Lockdown System | 2008-2014 Subaru WRX/STI (TS-SU-603)2008 2014 Subaru WRX STI Rear Differential Lockdown System by Torque Solution Torque Solution continues to push the limits of high performance aftermarket products with our "NEW" Rear Differential Lockdown System. This system was designed to reduce the 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