On the 4L80-E Transmission (Diesel and 7.4L gas engine), Transmission fluid may leak through the electrical connector on the side of the transmission, damaging the wire harness and causing the transmission to shift erratically. Our technicians tell us there are updated shift solenoids, an internal transmission harness, and a connector pigtail available to correct this fault.
Transmission Fluid Leak, Erratic Shifting on Chevrolet G Series Van (G30)
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My transmission shift from 1st at 10mph and into 2 at 20mph but will not shift into overdrive....
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Fluid level is where it should be.