The ZL-1 is supposed to come with 3:70 gears. The new Mustang 5.0 has them as well. Just to compare speeds on my 3.70 gears. Use these speeds to compare to your M6 factory 3:45 gears.
2,000 rpm 4th gear = 45 mph
2,000 rpm 5th gear = 55 mph
2,000 rpm 6th gear = 68 mph
Not a huge change but very nice on the street plus it makes 5th and 6th more practicle on the freeway. My car will not be on the drag strip.
