6 speed tranny info?
 

Hey guys I currently don't own a GT-R but am interested in obtaining one. I haven't decided between a z32 or an r32. I know the z32 is a 5 speed with the same final drive as the skyline transmission and has a top speed of 155mph. I however can't find any information about skyline (gt-r if theirs a difference) transmissions. Maybe you guys could help me out.

Basically I want to know these things:
When did the 6 become available on GT-R's. I'm aware their not on the earlier models.
What is the top speed of a GT-R.
What RPM do you guys run at say 100km/h (60mph).

Thanks for reading. Good luck with answering the questions.
Any extra info would be greatly appreciated. Cheers.