1989 Chevrolet K1500 350, what is the OEM part number, and where is this on the pickup?
P0785 CHEVROLET - 3-2 Shift Solenoid Circuit Electrical Read more: https://www.autocodes.com/p0785_chevrolet.html
The shift solenoid is inside the transmission, but with age of your Chevy you should consider having a transmission specialist check it for you since other transmission components may be worn out as well.
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