Bring a large pot of salted water to a boil and cook rotini pasta until al dente, approximately 8 to 10 minutes.
Drain the pasta and rinse immediately with cold water until the pasta is chilled.
In a small bowl, combine the cooled pasta with 2 tablespoons of pickle juice to prevent sticking and add flavor.
In a separate large mixing bowl, whisk together the mayonnaise, sour cream, remaining pickle juice, garlic powder, black pepper, and salt until smooth.
Add the chilled pasta, diced pickles, cubed cheddar cheese, red onion, and fresh dill to the dressing bowl.
Fold all ingredients together until the pasta is evenly coated.
Cover and refrigerate for at least 1 hour before serving to allow the flavors to develop.