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if the wheel alignment is faulty ( castor wobble ) at 70 mph there is no way that you can describe it as a vibration as it virtually rip the steering wheel out of your hands. If it is a torque converter problem then at around 3850-4025 rpm stationary there will be a vibration of the vehicle and engine The sort of vibration that you are experiencing at 70 mph will come from a drive line problem. If rear wheel drive then it could be faulty "U" joints, worn slip joint or failed rear engine mount
If front wheel drive it may be cv joints or bent drive shafts,wheel bearings or brake callipers not moving freely on the mounting bolts.
First of all, the noise is not coming from the rear. The noise is only happening in 4WD mode, that involves the transfer case and front differential. When was the last time the transfer case fluid change, it is recommended that it be changed every 50K miles. It is possible that you have transfer case issues. It is not recommended to operate the drive system in Auto mode constantly, this will wear out the internal clutches. If the road surface does not warrant 4 wheel drive, keep the selector in 2WD.
low range means you are in 'low range 4 wheel drive' push the button while the engines running and the gear shift levers in neutral to switch to high range [or 2x4] low range,cannot drive over 15 miles per hour,high range can drive up to 65 miles per hour. see the difference? you need to shift the transmission to neutral,while the engines running,and your foot on the brake pedal, push the button on the 4x4 to light up to the two wheel or rear wheel diagram. then when it lights up the 2 rear wheels, it's in rear wheel drive. if this does'nt describe your problem! please do not attempt anything and call toll free# for mercedes roadside assistance for free at 1-877-815-9962 these people have been a great asset to my buisness. thank you for choosing fixya.com
Normally 4 wheel drive HIGH is engaged on the fly or as you are moving more than 10 km per hour or 10 miles per hour but 4 wheel drive LOW is engaged at around 3 to 5 mph. no more or you could ruin the transfer case. Try going from 2 high to 4 high by switching back and forth and then try 2 high to 4 low when idling along. What usually happens is the mechanics under the car freeze up or rust up and you have to switch back and forth to free it up.
I have a 2006 rav4....there is a button to the left side of the radio labeled 4WD push it and 4WD light comes on on dash. It is electronic. Bad thing is that it automatically turns off the 4WD when the car reaches about 25 MPH....This means that if you want to sling mud while going through a puddle at 10MPH while reading 40MPH on speedometer...you are out of luck.
Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!