Grand Cherokee Knock sound when using 4WD Low?

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98
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Oman
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Today I just turned the 4WD in my car and I'm not sure if it's normal or not but when I activate it (In Neutral Gear) and then change it to Drive Gear the car makes a knocking sound and feels like it's moving a bit forward! (Even though I'm pressing the brake I don't know if it's normal or not? I drove about 30,000 KM with no issues or anything. I also noticed that when I use 4WD low the gearbox starts at 2, not 1. 2018 Grand Cherokee Laredo 4x4 Thanks
 
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98
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Oman
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Originally Posted by HoosierJeeper
Completely normal! ton more torque in 4LO. Just not good on dry pavement, but good to exercise it now and then.
How can I exercise it? should I use it in the desert on sand?
 
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1,480
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WI
If you're not an avid off roader, it's good enough to just pop it in and out a few times a year in the drive way, just drive forward and back. In the sand, 4LO is good if it's pretty deep, but in my off road experience I usually use high range and air down to 15PSI.
 
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190
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MD
The wk body styles were known to destroy the front differential mounting bushings. Not sure if 2018s are prone to this as well as I quit the dealership around 2013. They'd knock under heavy throttle from the front end, which you may have not noticed but the extra torque of 4low could be magnifying it.
 
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