R180 Rear Differential Assembly 3.545 Ratio

The Subaru OEM R180 Rear Differential Assembly, part number 27011AB221, is a genuine component designed to replace the rear differential in select Subaru STI models. This differential features a 3.545 gear ratio, identified as code 27011 in Subaru's diagrams. This differential is specifically listed as compatible with Subaru STI models from 2008 to 2014. It may also be a direct replacement for earlier Subaru Impreza, Impreza STI, and Impreza WRX models from 2007-2014, and potentially other Subaru vehicles dating back to 1985, depending on specific R180 R&P ratios. If you are experiencing symptoms such as gear whine, clunking, or bearing noise originating from your rear differential, this genuine Subaru OEM replacement may be necessary. Contact a certified Subaru dealership or qualified technician to diagnose and confirm the issue before proceeding with replacement. Please note that Subaru of America's warranty policy requires parts to be installed by a certified Subaru dealership and match the vehicle's VIN.