Combine spices in a small bowl, mix well.
Massage spice mix into pork and place in crockpot.
Pour soda over pork.
Cook on low 5-7 hours, until pork is tender and pulls apart easily.
Drain completely, shred pork using 2 forks, add 2 cups barbecue sauce and cook on low for one hour.
Serve on toasted bun with a pickle slice and more of the remaining 1 cup barbecue sauce.
