2001-2010 Allison 1000 transmission extension housing for 4x4 trucks. This is the flange to which your transfer case mounts. All extension housings have been cleaned, have no damage, and are ready to install. You will need a specific socket to remove the nylon lock nut from the transmission to allow your old housing to slide off; we recommend Merchant Auto’s socket- part number 10623. Does not include any hardware.
