Tried to remove bolts for transfer case shift bracket but one is just spinning. What’s going on under there?

Vtx531

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Kalamazoo, MI
While putting in new floor pans today, I tried to unbolt the shifter bracket that is attached to the transmission tunnel - four bolts. One of them is just spinning and I can feel some sort of rubber spinning around.

Did I break off a weld nut or a speed nut? Anyone got and pics of what is going on under that bracket? Some sort of rubber bushing apparently
 
There are some rubber isolation mounts underneath. If they start spinning you may need to grip them with vise grips. Alternatively you could just grind the bolt head off and pluck it out from underneath.

You can see what they look like at numerous different points in this video:
Skip to about 6:15 for the actual focus.
 
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