This spread sheet gives you all the transmission ratios, final drive, and the shift points in mph as well as the rear wheel torque for the different combinations. It includes all gear ratios availabel for Z cars from 1970 - 1983. It is a great tool if you would like to change your gear ratios.
This spread sheet will tell you the mph you will be traveling at when it is time to shift for all the different transmission ratios and final drive ratios.
This spread sheet tells you the shift point in mph and the torque at the rear wheels for all the final drive ratios when using a late model 280ZX 5speed.