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M6 Mustang GT's come standard with 3.31 differential gears. A6 come standard with 3.15 differential gears. 3.55 and 3.73 gears are optional. However, both the M6 and A6 transmissions are geared more aggressively than the trannies in the SS. Here are the M6 ratios:
First 3.66
Second 2.43
Third 1.69
Fourth 1.32
Fifth 1.00
Sixth 0.65
And here are the A6:
First 4.17
Second 2.34
Third 1.52
Fourth 1.14
Fifth 0.87
Sixth 0.69
So, as grocerygetter said, it is essentially weight and gearing.
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