Coelocanth81 Posted April 25, 2021 Share Posted April 25, 2021 I have a '76 280z that has received a 5 speed swap prior to my owning it. Did the 5 speed transmissions even have a "top gear switch" for the purpose of advancing the distributor? I'm thinking about removing the vacuum switching valve when I rebuild my fuel rail. Quote Link to comment Share on other sites More sharing options...
rossman Posted April 27, 2021 Share Posted April 27, 2021 The only manual transmission switches are neutral and reverse. Quote Link to comment Share on other sites More sharing options...
NewZed Posted April 27, 2021 Share Posted April 27, 2021 (edited) Actually, 76 does have a top gear switch actuated solenoid that controls the vacuum to the vacuum advance module on the distributor. One of those emissions things. There are a lot of different 5 speeds out there. Some of the ZX 5 speeds have neutral, top gear, reverse, and overdrive switches, at least the FSM says they do. I removed my top gear solenoid when I got a 5 speed and just let the vacuum advance happen in all gears. Ran great. Just connect the hoses or run a new one to the same port on the TB. I think I've seen it described somewhere in the FSM but can't find it. It's in the wiring diagram also though. Underlined the two parts connected. Edited April 27, 2021 by NewZed Quote Link to comment Share on other sites More sharing options...
rossman Posted April 27, 2021 Share Posted April 27, 2021 Well, I stand corrected! My first s30 was a 76 with a 4 spd manual. I don't recall a top gear switch but that was a loooong time ago! Quote Link to comment Share on other sites More sharing options...
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