If its an automatic half ton its the 4l60E if its a one ton its the 4l80E
Your 1996 GMC Sierra truck might not go in reverse because the transmission fluid is empty. You might also have damaged the transmission or the transmission linkage could be broken.
the transmission in a 1996 2x4 sierra is called a 4L60E. It is a 4 speed automatic with electronic overdrive.
My 1986 GMC High Sierra 1500 stock transmission is a 700R4. My 1986 GMC High Sierra 1500 stock transmission is a 700R4. it could also be a th 400
The 2008 GMC Sierra-2500HD has a 6-speed automatic.
The 2006 GMC Sierra-2500HD has a 5-speed manual.
The 2014 GMC Sierra-2500HD has a 6-speed automatic.
The 2012 GMC Sierra-2500HD has a 6-speed automatic.
The 2008 GMC Sierra-3500HD has a 6-speed automatic.
The 2007 GMC Sierra-3500HD has a 6-speed automatic.
The 2013 GMC Sierra-2500HD has a 6-speed automatic.
The 2011 GMC Sierra-1500 has a 4-speed automatic.
The 2001 GMC Sierra-2500HD has a 5-speed manual.