Some advice please. If I am not going to install a S/C or go with the spray. Like all of us, I want the best dollar for dollar set up. I have an 03 auto V6 Mustang. I want to install 4.10 gears and Tlok. What would be the best route to go? Mod my 7.5 rear end with the gears/Tlok and hope the place that installs the parts know what they are doing or get an 8.8 rear end that already has a Tlok with 3.73 gears? Is there really a BIG difference between 3.73/4.10 gears? What would you guys do? Thanks for the words of wisdom.