This 1.25-inch wide transfer case chain features 80 links and is designed for use in X3 E83 models (2003–2011) with 2.5L and 3.0L engines, including both petrol and diesel variants.It is compatible with the ATC400 transfer case and serves as a replacement for OEM reference numbers including 27103455139, SP00178, HV-086, N902, 29 02, 27103455132–27103455138, and 27107539262–27107539266.The chain has a pitch of 0.375 inch and includes 40 plates per side.Product condition: brand.Package includes only the transfer case chain as shown in the product images.