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Grand Cherokee Knock sound when using 4WD Low? #5246243 10/21/19 03:58 PM
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John344 Offline OP
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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

Last edited by John344; 10/21/19 04:00 PM.
Re: Grand Cherokee Knock sound when using 4WD Low? [Re: John344] #5246270 10/21/19 04:29 PM
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zrxkawboy Offline
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Sounds normal to me.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Grand Cherokee Knock sound when using 4WD Low? [Re: John344] #5246286 10/21/19 04:52 PM
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HoosierJeeper Offline
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Completely normal! ton more torque in 4LO. Just not good on dry pavement, but good to exercise it now and then.


19 Jeep Renegade Trailhawk 1.3T
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Re: Grand Cherokee Knock sound when using 4WD Low? [Re: HoosierJeeper] #5246318 10/21/19 05:35 PM
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John344 Offline OP
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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?

Re: Grand Cherokee Knock sound when using 4WD Low? [Re: John344] #5246354 10/21/19 06:18 PM
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HoosierJeeper Offline
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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.


19 Jeep Renegade Trailhawk 1.3T
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Re: Grand Cherokee Knock sound when using 4WD Low? [Re: John344] #5246567 10/21/19 09:36 PM
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JLTD Offline
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Normal. With 2.7 times the torque, it's going to try to move.


I use the overseas manual to choose my viscosity.


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Re: Grand Cherokee Knock sound when using 4WD Low? [Re: John344] #5246657 10/22/19 03:48 AM
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t1snwrbrdr12 Offline
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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.

Re: Grand Cherokee Knock sound when using 4WD Low? [Re: John344] #5246672 10/22/19 04:29 AM
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Skippy722 Online Happy
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The torque multiplication is huge when in low range. Won’t go very fast, but there’s tons and tons of torque.


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