Do I need the bearing kit for when I install my new gears? I only have around 3300 miles on my mustang, but people tell me to get it and I dont htink I need it. I also am getting the Diablosport Predator to recalibrate the speedo for the 4.10 gears I am getting. What settings do you guys with the Predator think is the best? Thanks in advance for any help.