Is it possible?
I want a first gear on my f20 to give more mph. Because I will put a 3.94 fd to have more accelaration. But first gear is better to give more mph.
Thanks
When i bought my mk3 astra turbo it had a f20 box with a f25 diff set fitted.
My previous mk3 gsi had a normal f20 box and the one with the f25 diff set done more mph in every gear .
F20 with F25 diff set
40 mph in first
80 mph in second
112 mph in third
137 mph in fourth
150 mph in fifth
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