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The 83 280Z 5 speed in my 76 280Z with the original 3.54 rear end. .75 overdrive gave it a 2.65 final drive which worked out to 3000 RPM at 85 MPH. It would have been neat to see what that car could have done if configured for hypermiling, since you could add a resistor in line to the water temp circuit then tighten up the spring in the flap air flow meter and have dash adjustable lean burn for cruising.
The old tech EFI on that 76 Z was very basic but the car had no catalyst, EGR, or air injection from the factory and that configuration was legal in 49 states in 1976, because the exhaust was clean enough to no require any after treatment.
Transmission had internal linkage and when it had fresh bearings and good synchros it was one sweet setup that could handle the available engine power. Nissan did upgrade the gearbox for turbos to a T5 BW tranny, but the stock 5 speed was a beautiful lightweight transmission.
regards
Mech
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