Call 4 wheel parts and talk to Will. He's a good guy and will hook you up. My buddy had 4.30's put in his truck and Detroit locker put in at the same time. They done a great job and he's had zero problems with them.
Another option is Gear Works. They are located in Clearwater. Another guy I know had 4.30's put in his truck there and says nothing but great things about them.
Gear Works
1410 N. Hercules Avenue
Clearwater, FL 33765
Phone: 727-784-0452
I've heard a lot of bad things about Northside. But then again, you always hear good and bad about all shops.