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I was browsing Mazda's site yesterday looking for information about brakes, and I stumbled upon some interesting information regarding the MT, and the gearing is different between the 3i and the 3s, and how the final drive differs between models. The gearing is as follows:
Mazda 3i Sport
1st: 3.363
2nd: 1.947
3rd: 1.300
4th: 1.029
5th: 0.837
6th: 0.599
Reverse: 3.385
Final Drive 3.850

Mazda 3s Grand Touring
1st: 3.700
2nd: 1.947
3rd: 1.300
4th: 1.029
5th: 0.837
6th: 0.599
Reverse: 3.724
Final Drive: 3.850

Things get interesting with the Mazda 6, as it shares the gearing of the 3s Grand Touring, but has a shorter final drive
1st: 3.700
2nd: 1.947
3rd: 1.300
4th: 1.029
5th: 0.837
6th: 0.599
Reverse: 3.724
Final Drive: 4.105

And the CX-5 has an even shorter final drive
1st: 3.700
2nd: 1.947
3rd: 1.300
4th: 1.029
5th: 0.837
6th: 0.599
Reverse: 3.724
Final Drive: 4.705

My guess is that they use a shorter final drive to compensate for the increased weight of each vehicle, but if you could remove the ring and pinion gear from a CX-5 and put it in a 3, it would make for a much faster vehicle! As far as I'm aware, the transmission is the same for each vehicle, so would it be possible to swap trannies, or even better, just change out the final drive? I'd ask the guys at my shop, but I've annoyed them with enough questions already.
 
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