Are you trying to get it out of park ? let me know Thanks ROY!
I need to know what knob you are talking about is it stuck in park? let me know Thanks ROY!
The shift lever is stuck this is a interlock shifter you could have a bad brake switch , there is a release button on top of the shifter remove the little cap and insert a small screwdriver or key in hole push it down to release the shifter to drive the truck, try this Thanks let me know if you need more help ROY!