CK5
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700R4 vacuum switch ??

Get that switch working. I killed my first 86 tranny by taking it off, thinking it was unnecessary smog crap...:whistle::whistle::doah:
 
And I think I see why you had trouble finding one. Read the info on your emission label vertically. You get trans "trans conv vac sw" and "purge signal hose"...
 
If it's too spendy for you let me know. Mine's still on the truck, but my lockup is ECM controlled now since I switched to fuel injection. As far as I know it works and wouldn't be a big deal to pull it off.
 
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