I see alot of people talking about gearbox ratios on the Fiesta Mk3, so heres a couple of the ratios that i know. If you know any please let me know via the comments box and i will add them to here.
RS1800
1st, 2.95:1; 2nd, 1.94:1; 3rd, 1.34:1; 4th, 1.0:1; 5th, 0.80:1, Final drive: 3.82:1
RS Turbo
1st, 3.15:1; 2nd, 1.91:1; 3rd, 1.28:1; 4th, 0.95:1; 5th, 0.76:1, Final drive: 3.82:1
Working out what box
With this info you can use the following tool from www.gearboxman.com. Just enter your tyre size, put in the rations and view your speeds! Ideal for working out what gearbox to use!
Right click, save as.