How do you engage 4-wheel drive on a Dodge Ram 2500?
How do you engage 4-wheel drive on a Dodge Ram 2500? To engage four-high range or auto, let off the throttle and shift into four-high mode or auto mode. On manually shifted models, the "4WD" light on the instrument cluster will illuminate. On electronically shifted models, the "4WD" will flash during engagement and will turn solid when engagement is complete. What makes a Dodge Ram go to 4WD? When shifting into 4WD, a synchronizer in the transfer case spins the front driveshaft and the shift lever engages the vacuum actuator switch. The vacuum lines then signal the vacuum solenoid on...