MST rear drum brake removal 

I need you to do a tutorial of taking it apart and putting it together

Thanks for sharing... Looks eerily like my '99 K2500 Suburban! Not looking forward to doing that job.

if its the hex what size it do you know?

How was your front tires being blocked from moving ? How did u test the drag ? Did u put it in neautral while u chalk the front tires and jack stands on the rear axle ?

Gpitoiyyy

You don't need new lug nuts or to chase any threads. You NEED an ACTUAL IMPACT WRENCH.