see below link for the transmission and diff. #'s. The cars should be dynoed in 5th gear due to the 1:1 ratio so that there is no false multiplication of HP/TQ due to gearing. 5th simulates as much as possible as actually dynoing the motor by itself (of course you are still loosing approximately 10-15% through the drivetrain). Automatics should be done in 4th gear...
http://www.350z-tech.com/zwiki/Drivetrain
-J
