209s30280Z

I thought the only weight difference from the 240z,260z and the 280z was that most of the weight difference came from the heaver front and rear bumbers that were alot bigger on the 280 compared to the 240 and 260?

hello i have a 1976 datsun 280-Z- and i just had the tranny swaped it now has a 10.8lbs flywheel and stage 1 centerforce clutch! However the car drives and the tranny shifts fine no odd noises or nothing but the car dosnt seam to be running correctly now that the tranny has been swaped so im not sure what needs to be done? would i have to switchs all the parts over for that car that only comes with a manual tranny or whaT? would the engine have to be retimed? And the idle is fluctuateing up and down from 3,000 rpms?

I was wondering if any one can tell me if there are certain part numbers for the 4 speed tranny from a 5 speed one? How could i tell other than shifting it? because, its hard to tell when i shifted if felt like a 5th gear but maybe not because it was hard to get in that spot theirfor maybe its a 4spd idk. The only thing i see on my tranny is a #sign then 5 and has a spot for 2 sensors and i looked at a 4 speed one at pick n pill it has number 4 and only one spot for a sensor.