How to Replace a Shift Solenoid in a Chevrolet Silverado. The shift solenoids on your Chevrolet Silverado control fluid flow and transmission... 1  How to Replace a Transmission Solenoid Vs. 2  Rebuilding It.ow to Replace a Shift Solenoid in a Chevrolet Silverado. The shift solenoids on your Chevrolet Silverado control fluid flow and transmission... 1  How to Replace a Transmission Solenoid Vs. 2  Rebuilding It.