Sprinkle pork roast with seasoning mix and place in slow cooker.
Combine jalapenos, onions and orange juice. Pour over top of pork roast. Secure lid and cook on low for 6-8 hours.
Preheat oven to 425degF.
Remove roast from slow cooker (do not discard any of the liquid). Shred pork and spread out on a parchment paper covered baking sheet. Ladle two cups of liquid over top of the pork. Place in oven for 10 minutes.