GMC Sierra - No Forward or Reverse when HOT (60-Sec Preview)

Is your GMC Sierra automatic transmission working perfectly when cold, but then losing all gears (forward & reverse) when the engine heats up to operating temp?
GM 4L60E - No Forward or Reverse when HOT
• GM 4L60E - No Forward ... &list=UULFx_RrH0NPRyKoz9LwBa69hw
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Affected Vehicles:
1999 GMC Sierra automatic transmission problems.
2000 GMC Sierra automatic transmission problems.
2001 GMC Sierra automatic transmission problems.
2002 GMC Sierra automatic transmission problems.
2003 GMC Sierra automatic transmission problems.
2004 GMC Sierra automatic transmission problems.
2005 GMC Sierra automatic transmission problems.
2006 GMC Sierra automatic transmission problems.
2007 GMC Sierra automatic transmission problems.
2008 GMC Sierra automatic transmission problems.
2008 GMC Sierra automatic transmission problems.
2009 GMC Sierra automatic transmission problems.
2010 GMC Sierra automatic transmission problems.
2011 GMC Sierra automatic transmission problems.
2012 GMC Sierra automatic transmission problems.
2013 GMC Sierra automatic transmission problems.
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