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this is because its not fully shifting back into 2 Hi. make sure vehicle is in neutral and idling, push the 4 Low button listen for a shifting sound or whirring noise. then push 2 Hi button. it flashes while it is attempting to shift you should hear a shifting clunk or whirring noise, then the light will stay lit. after shifting from 2 wheel drive to 4 wheel drive shift into reverse before selecting drive on the column. the rpm going so high is because your vehicle is still in 4 wheel drive. the low gearing results in high rpm. if it does not shift into 2 wheel drive : there is a shift actuator on the transfer case, check the cable connected to it. this cable is connected to the vacuum control pump deal that controls you cruise control. this pump is located directly under the battery box. the plate the battery sits on must be removed in order to see it. check any wiring there and check for vacuum leaks in the lines connected to it . this pump actually pulls on the cable going to the shift actuator. check that the cable is attached and the baffle on the pump is moving. you can manually pull the cable by hand, while having an assistant operate the buttons inside the cab. this will release the actuator in the transfer case allowing the transfer case to shift properly. basically its a locking mechanism, locking the transfer case in the selected gear range. it must actuate in order to complete the shift
Verify that your trans fluid is at the correct level. When if at all was the trans last serviced?
If fluid is low, try bringing it up to proper level with Valvoline ATF+4 fluid. You need to used either fluid from a dealer, or the valvoline brand which is approved by Dodge.
That roaring noise should be a wheel bearing. Jack up the rear wheels and spin the tires by hand. You can hear a grinding noise if the noise inside the car is as load as you state.. The only other noise that will be like that is the differental gears inside the drive axle
3 suggestions for you, you may need to check the tire pressure, get a tire alligment done, or you have a bad wheel bearing, usally a bad wheel bearing make's a loud roaring sound going down the road. I hope I have helped you.
What do you mean by loud... Loud where??? If noise is from engine, make sure that the mechanical fan clutch is not "locked" (it's supposed to freewheel when cold... if it does not, it will "roar" when driving.
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