Yeah they're in the diff.

You need to compare the gearbox ratios not the diff ratios

Hm... Im a little confused now (the gearbox ratios are also a bit different, thou the 4 gear is the same), but dosent the final drive ration depend on the diff? (so if compared to an s13 i should have shorter gear ratios, since the final drive is different).
Or am i totaly wrong here now :confused:

No if you want to compare it to an S13 its fine, but I though wanted to see what the effect of using an S13 gearbox would be in an S12?

Thought so, thanks for clearing out everything for me ;) .

P.S. Since the gearbox is together with an ca18det engine, it makes more sence to compare the final setup with an s13 (in my opinion).

Yeah thats fairly good reasoning if you ask me

Is this pisble that i have dif ratio 4,3 ???
I chcked my speed with GPS today and at 3000 rmp on 4-th gear it says 80km/h after some calculations it turns out 4,34 mayby im wrong with my math. Weels diameter is 615 mm 195/60/15

Would work out that way to me as well, but I can only think your rev counter is over by about 400 rpm

I chcecked the rev counter with the piggy back and it shows the same revs. Mayby my GPS is a bit of. It is inacurate ba 5-10% so it would not be used as a guiding gizmo.