Q: How to remove and install a PNP switch on a Chevrolet Express for Chevrolet Express?
A: Disconnect the cable from the negative terminal of the battery. Apply the parking brake and put the shift lever in NEUTRAL. Raise the vehicle and place it securely on jackstands. Unplug the electrical connectors from the Neutral Safety Switch. Disconnect the shift cable from the manual lever. Remove the manual lever retaining nut and remove the manual lever from the manual shaft. Be careful not to move the manual lever from the NEUTRAL position while removing it. If you accidentally move the lever, install the manual lever on the manual shaft again and reposition the lever at NEUTRAL before removing the Neutral Safety Switch. Remove the switch retaining bolts and detach the switch from the transmission. If you're installing a new switch, align the slots on the switch with the alignment marks on the switch and the notch in the edge of the switch. Then install the switch onto the manual shaft. If you're installing the old switch, simply align the flats of the shift shaft with the flats of the Neutral Safety Switch and install the switch. Installation is otherwise the reverse of removal. When you're done, verify that the engine will start only in PARK or NEUTRAL. If it starts in any other gear, readjust the switch. To readjust the switch, loosen the switch mounting bolts and turn the switch slightly one way or the other until the engine now only starts in PARK or NEUTRAL, then tighten the mounting bolts securely.