mystery knock front end - Jeep Commander Forums: Jeep Commander Forum
Suspension / Lifts This is the place to discuss the suspension, lift systems, and other stuff underneath your Jeep Commander

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post #1 of 13 (permalink) Old 04-07-2015, 08:31 PM Thread Starter
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mystery knock front end

been chasing a front end knock for over a year now.

basically when you accelerate and brake you can feel a knock through the steering wheel and its audible enough to hear inside the cab with windows closed.

2006 Commander
113,000 miles
Rock Road 2.5 lift
1.5" spidertrax spacers
265-tires

just picked the commander a couple hours ago with work completed and knock is still there.

List of new parts

Struts
New hardware on rock road lift pedestals
upper control arms
lower control arms
sway bar bushings
swaybay end links
steering rack and inner/outer pieces
calipers/pads/rotors
cv joints (left and right)
foward drive shaft
nose cone bushings

any thoughts would be helpful....
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post #2 of 13 (permalink) Old 04-08-2015, 12:13 PM
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Front differential bushings.

06 Jeep Commander 4.7 QT II wih RC lift, Superchips 3872 and 245/75R17 Thunderer MT Tires

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post #3 of 13 (permalink) Old 04-08-2015, 01:24 PM
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Originally Posted by fco27 View Post
Front differential bushings.
Seems very logical. I'd check this next.
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post #4 of 13 (permalink) Old 04-14-2015, 10:48 PM Thread Starter
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diferential bushings were ok

they put a defective steering rack in, thats #3 in 8 months....
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post #5 of 13 (permalink) Old 04-14-2015, 11:36 PM
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I have the same thing, except it's only over bumps, had everything checked out and everything is good condition, no one can tell me what it is,
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post #6 of 13 (permalink) Old 04-15-2015, 10:04 AM
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What's a Nose Cone Bushing?

The transfer case chain can wear and that can cause some lash between the output for the front/rear driveshafts. Shifting between pre-load on the drivetrain, either acceleration to braking or vice-a-versa will spin the shafts to either side of the lash and then stop.

I have something similar to what you describe, but its NOT bad enough to call it a clunk noise, you can only feel a slight clunk from time to time under the same conditions. I twist driveshafts output on either side of the xfr case and find more lash than I would expect. Leads me to believe my chain is stretching a bit.

As well, if you're overdue for servicing the xfr case, you might want to do it. There are freewheeling units in it that old/bad fluid might slow down their engagement contributing to the problem.


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post #7 of 13 (permalink) Old 04-15-2015, 12:35 PM Thread Starter
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Quote:
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What's a Nose Cone Bushing?
Its the top bushing on the front diferential, requires lowering of the axle to replace.

Had mine replaced with custom aftermarket polyurethane one after having it fail a couple of times usually costs 450.00 a pop....
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post #8 of 13 (permalink) Old 04-15-2015, 12:37 PM
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Join Date: Apr 2014
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Quote:
Originally Posted by bucketmouth1 View Post
diferential bushings were ok

they put a defective steering rack in, thats #3 in 8 months....
The top one? You have to drop the diff to get to it IIRC.
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post #9 of 13 (permalink) Old 04-15-2015, 12:39 PM
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Join Date: Apr 2014
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Quote:
Originally Posted by bucketmouth1 View Post
diferential bushings were ok

they put a defective steering rack in, thats #3 in 8 months....
The top diff bushing? You have to drop the diff to get to it IIRC.

Hrm 3 defective steering racks sounds like a PITA.

Last edited by luckyse7ens; 04-15-2015 at 02:16 PM.
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post #10 of 13 (permalink) Old 04-15-2015, 02:09 PM
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NOT necessarily, the first one failed for a reasonable reason and it was replaced, the replacement failed within 8 months, that is unreasonable, replaced again, thus he says he's on his third in 8 months. That "could" mean he's only had one bad rack.

He has a lift also, although 2.5" doesn't sound like enough to do that, but it ain't helping keeping the steering racks having an easy life.


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