A couple of questions.

I have a RHD 240Z with a transplanted L28 (From 79 I think) it is mated to a 5 speed gearbox.

I want to know if there is any way I can find out whether the gearbox came from the same 280ZX as the engine.

The reason for this is I need to replace my speedo cable and am unsure if they were the same from 240 to 280ZX. ie, do I need to buy a 280ZX cable or will a 240Z one work?

Thanks in advance.

The 240Z cable works fine with a ZX transmission. No difference on the transmission end.