The Si final drive in the ZC

Hey guyz..

i ve a question about tranny.i want to put the Si final drive
in the ZC.Some of my friends did and they say worked pretty good but i was wondering if it has any problems?if anyone tried it?

ZC: Si:

1st: 3.250........ 3.250
2nd: 1.944........ 1.894
3rd: 1.346........ 1.259
4th: 1.033........ .937
5th: .878........ .771
final 3.888........ 4.250

you see the final drive differences u've to see it on rolling,accelerating.

Does anything go wrong??