Free Shipping To Continental 48 Only- All others please message for ship quote SOUTH BEND ISK1.375 INPUT SHAFT UPGRADE KIT For 1994-2003 DODGE 5.9L CUMMINS NV4500 Increase strength in your 1994-2003 Dodge 5.9L Cummins NV4500 Transmission with the South Bend ISK1.375 Input Shaft Upgrade Kit. This input shaft upgrade kit is for use on clutches that require 1-3/8" input shafts.