1、OE Number: The referencing OE number of this differential locker is SL C8.25 29, which is molded and designed depend on the original data. 2、Fitment: The differential axle locker is a replacement for Imperial 1981‑1983, for Fifth Avenue 1983‑1989, for New Yorker 1976‑1982, for Aspen 2007‑2009, for B100 1976‑1980. 3、Main Function: The locker physically joins the drive axles together so they deliver an equal amount of torque to each tire, regardless of available traction. 4、Durable Construction: Made from high strength steel, this locker is built to withstand rugged off road conditions and ensure long lasting durability. 5、Increased Off Road Capability: By locking both wheels on an axle together, this differential locker enables better power distribution and increased traction.