Alrighty guys, what do you think? Should I get 4.10's or 4.56's? I'm leaning towards 4.56's, but I really don't wanna destroy my highway mileage, not to mention up the wear and tear with the rmp increase. I have a 3.7L V6 with a NV-3500 5 speed. Currently at 75mph in 5th I'm at about 2200rpms, give or take. I love my V6, it's got more balls than you would think, but it's still a V6. Anyone who has a 3.7L with 4.10's or 4.56's please reply and let me know what your rpm's are at different speeds. Much thanks!!