Place the chuck roast in the bottom of a slow cooker.
Sprinkle the ranch seasoning and au jus gravy mix over the roast.
Place the stick of butter on top of the roast.
Add the pepperoncini peppers around and on top of the roast.
Pour in the pepper juice if using.
Cover and cook on low for 8 hours or until the meat shreds easily with a fork.
Shred the meat and mix it with the juices before serving.