2005-2010 Duramax TransGo SK Allison 1000 Jr Shift Kit (SK Allison Jr)

This kit can be installed in 2001 to 2005 vehicles with the Allison five-speed transmission, however, using this kit with these first design earlier five-speeds will not provide the 111% increase in torque capacity needed for 4th and 5th gear. Repeated failure of the C2 on these five-speed units is a common complaint, therefore we highly recommend installing part # ALLISON SK instead of this Allison-Jr for these early five speed units.