i totally agree regarding that gearbox ratios. The genuine Mustang-boxes ratios would "meet" the 3,73:1 well, but i heard rumours about some other make of 6-speed box beeing fitted to the customer cars - ratios not known up to now (or DOES anybody yet????).
So i´ll await my testdrive SOONEST to decide (& ask for the "proper" rear diff ratio..) finally
It doesn´t matter how fast it becomes, but how it becomes fast. 2015 Roadster 3.7