Hi, i made an error above I need to set right..I did this 3 years ago, and yesterday had a brain fart on which way trans lever moves .. It is forward to put trans at low pressure early shift, back to up pressure, hard shift, higher speed . So spring in linkage cannot work as I described it above. This same confusion dogged me with trying to get slant trans correct acting in 67 dart with no linkage at all as i got it. Some moron just tossed it, to put a ford truck carb on slant. I wanted trans to work right after resto. Some said forget it, trying to figure this out, just find 67 "no spring" linkage, but i want to know why. I ended up with another year slant/904 linkage, it had the damn spring... How it all started. At the same time struggling with LOKAR on another car, and i bought a LOKAR for this car, and was trying to understand what is going on , when other slant linkage became available, and it fit OK , looked stock, after some modification of vertical rod from manifold pivot to carb. This relieved struggle with getting LOKAR right.
I looked at it again last night; the service manuals are all 100% concerned with getting the trans pressure lever full forward to stop when carb is shut, as I said above , in a "logic of what i said" sense , but I noted a lot of concern with choke/fast idle off when doing it . As carb won't close as much when on fast idle, trans would not either, this indicates it is pretty critical, could be a reason for spring, but spring seems to work other way round.
So what the hell is spring for? The only thing i can see is if trans held throttle linkage somehow, trans would prevent throttle from closing when you lift off the pedal. Maybe it is a safety function, that lets throttle slam shut even if trans delays or slows shutting somehow? That is the way spring stretch is acting, and the only reason i can see why slot is so very long? If it was just about setting overtravel or zero setup, a 1" slot would do it, but slot is many inches long. Why?
Back to LOKAR, it seems John RR is closest to what make sense , it must be against stop in trans forward when at idle, without hurting fast idle/choke , and as near to full back as it can go , at WOT, with a gap left if anywhere at that end, as John says, but that gap gotta be small.... ; LOKAR must push back through cable? a spring at lever in compression behind lever and a clamp hitting a passage hole in front might let it accommodate carb fast idle moves awhile keeping it against trans stop no matter what carb is doing when carb is closed; WOT you would set if need be by moving attachment points to be sure it pushes lever back almost 100 % without, or just before bind at WOT.
WHEW!
Bottom line:we still do not know the why, on spring and I am sorry for possibly adding to confusion with descriptive errors above. This seemingly simple thing drove me crazy....
