R32 diff/gearbox ratios

I just had my auto R32 GTSt converted from auto to manual by Croydons in Auckland. It came out pretty good but i think they may have left the auto diff in.

My speedo reads faster than u are actually going, doing 120 when it is really 105-110 kmh.

Also in 5th im doing about 3500 revs at what the speedo says is 115. This to me seems excessive. Is this the same for other GTSt owners?

Thanks

Well dude you are lucky I have found a pge that has a converter to tell you how fast you are going@ what revs.
the gear ratios for the r32 are here btw the manual and auto have the same diff . this is from the sdu site the gear ratios.
http://www.skylinesdownunder.co.nz/tech/r32/index.html

here is the converter on the top left put in your tyre size series i.e 55 the wheel height in inches.
then put in on the right the gear ratios and the last one in this group is for you diff ratio then bobs you uncle its done.
and press the lower button for it to work it out

http://village.infoweb.ne.jp/~naninani/utility/gear.html
cheers
meggala