Hi,
I'm middle of 240SX F5W71C tranny conversion to 280Z.
This tranny's speedometer pinion is red(4.1 final gear ratio) which is wider diameter comparing with lower final gear ration from 280Z(Black one).
https://www.youtube.com/watch?v=esW9tjb6Loo&feature=youtu.be
Therefore, just plugin 280Z speedo pinion won't touch gear drive.
I have 4 speed tranny from '75 280z. F4W71B.
When I check FSM, I cannot figure out whether it comes with white nylon cog gear drive or not.
Does anyone know whether 4 speed tranny has it?
reference:
http://czot.org/forum/showthread.php?1760-Speed-Pinion-Gear-and-Housing-Combinations-%28-70-78-240-260-280Z%29