This switch is for use on 2004-2005 Model year trucks. Double check your switch to ensure it is the single connector part.
One of the most common problems with the Allison transmission is failure of the Neutral Safety Back Up switch.
Application: 2004.5-2005 Duramax
Some of the symptoms of failure include but are not limited to:
No start condition
Gear shift indicator on dash not following properly
Trans stuck in limp mode or fail safe
DTC's set indicating pressure switch codes
This switch easily installs with just common hand tools.