A lifted Crosstrek on a loose climb often stalls with one rear tire spinning and the other doing nothing, because the factory open rear differential sends torque to whichever wheel has the least grip. The Torq-Master R160 Rear Locker replaces the spider gears in the rear differential with an automatic, fully mechanical locker CNC machined from 9310 steel, so both rear wheels pull together under power and unlock to turn normally when you coast. Fitment covers 2013 to 2026 Crosstrek models, with the correct carrier chosen by year, transmission and Wilderness trim in the dropdown. Torq-Masters has confirmed installs up to a 2018 Crosstrek with X-Mode and does not guarantee newer traction control systems, which is worth knowing before you commit. Fitting it means pulling and opening the rear diff, a job our Calgary shop handles alongside lifts and armour. Canada-wide shipping from Flat 4 Offroad in Calgary.