I am building a Mk6 escort for track day use only. I would like to sacrifice some top end speed and maximise acceleration by changing the gearing.
I have been informed that in the IB5 range of gearboxes the gear ratios are all the same and it is the final drive ratio that is different.
Please could someone tell me what final drive ratios are available and in what model(s)there are generally fitted?
Also how do you indetify the final drive ratio of the gearbox?

Thanks

 

These are Fiesta and Puma ratios. (copied from jason33 of zsoc)

1.25/1.4 and 1.6 Zetec S Gear Ratios were found to be as following:

1st 3.58
2nd 1.93
3rd 1.28
4th 0.95
5th 0.76

The 1.7 Puma box however has a slightly taller 1st gear and a closer 3rd, 4th and 5th gear:

1st 3.15
2nd 1.93
3rd 1.41
4th 1.11
5th 0.88


The 1.6 Zetec S, has a 4.25 Final Drive Ratio

The 1.25/1.4, has a Final Drive Ratio of 4.27.

The 1.7 Puma has a Final Drive Ratio of 3.82

People tend to go down the route of 1.6 Zetec-S ratios and the Final Drive from a 1.7 puma which is the same as an Ford Racing Puma box.