**Cook the Pasta:** Bring a large pot of salted water to a boil. Cook the pasta according to package instructions until al dente. Drain and rinse under cold water to stop the cooking process.

**Prepare the Dressing:** In a small bowl, whisk together the mayonnaise, sour cream, pickle juice, Dijon mustard, garlic powder, salt, and pepper. Adjust seasoning to taste.

**Assemble the Salad:** In a large mixing bowl, combine the cooked pasta, diced pickles, red onion, celery, and fresh dill.

**Add the Dressing:** Pour the dressing over the pasta mixture and toss until everything is evenly coated.

**Chill:** Cover and refrigerate for at least 1 hour to allow the flavors to meld.

**Serve:** Stir before serving and garnish with additional fresh dill, if desired.