Question about 1979 Chevrolet C/K 3500
I am restoring a '80 model Revcon 33' couch that has 454 chev. components,however, the wiring is like 'Johnny cash's car...relly mixed up. I'd like to get an '80 chevy truck wiring diagram so that I could get things organized under the dash, and beyond! Thanks, T. Mack moody
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Posted on Jan 02, 2017
SOURCE: 89 chevy 2500 silverado
that was old school , vehicles with the turbo 400 transmission are equipped with an ECM controlled downshift system , when vehicle is at speeds below 70 mph a forced (detent) downshift is possible by fully depressing the accelerator ,when the ECM detects a drop in manifold vacuum (high map sensor reading) the downshift control relay is energized by the ECM , the relay detects battery voltage to the detent solenoid in the transmission to open open an oriface to force the transmission to downshift ..... if yours is not working i would first check the downshift relay , under hood , picture is so bad i can't tell , looks like on the firewall more to the passenger side , next to fuel pump relay , if it needs more diag than that maybe you should get an estimate for repair from a trans shop or such , hope ya fix it , cheers .
Posted on Jan 09, 2009
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