2012 GM 3500HD question

/ 2012 GM 3500HD question #1  

Hay Dude

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What is this knob/switch for?
Its not the 4WD Selector, the 4wd selector shifter is on the floor.
 

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/ 2012 GM 3500HD question #2  
Maybe pto switch....:2cents:
 
/ 2012 GM 3500HD question #4  
PTO rpm lock set.
 
/ 2012 GM 3500HD question
  • Thread Starter
#5  
Thanks!
 
/ 2012 GM 3500HD question
  • Thread Starter
#7  

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