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PB -PC Challenger 2009 - 2014 Covering 2.5 HP diesel

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Old 11-11-13
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old Jack old Jack is online now
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Default Rear Diff Dynamic Dampener.

Our Challengers are fitted with a "Dynamic Dampener", this is bolted to the front underside of the rear diff and my understanding is it is to dampened driveline vibrations. Unfortunately it hangs down low and protrudes forward.

I have "kissed" it several times when off road resulting in a minor gouge or two, but on the weekend, whilst playing at Jakem's Farm with some Pajero Forum guys I hit it hard. I was going through a deep rocky gully/small creek and there was a submerged rock that I did not see. I know, I didn't walk it or even get out of the car to have a look, I was not the first across but I must have taken a slightly different line to the other guys or the Paj in front kicked it up, either way my fault.

Today, when doing my post off-roading underbody checks, I discovered the Dynamic damper badly twisted, 1 bolt sheared off and the Dampener pushed back on to the sway bar







So I removed it, it is heavy at 4kg and attached using 4 x 10mm dia bolts, took the car for a drive expecting to hear or feel some vibration especially since the rear coils have lifted the rear end 75mm over standard but there was no discernible difference at any speeds up to 110kph. I may not be able to feel or hear anything over the ST Maxx tyre and roof rack noise. So at the moment I am driving without it until I decide which course of action to take.

It must be there for a reason, MM would not have bolted it on just for fun, so I am reluctant to run permanently without it as if something does happen then it may void my 10 year driveline warranty. Vibrations and harmonics are funny things and I do not have access to the equipment to do vibration testing but I do know some vibrations can not be easily felt but cause long term stress damage.

My options are; repair the original, replace the original, leave it off all together or make a new dampener that is tapered at the front so it can not catch and be levered backwards. Maybe it protected the diff from damage or maybe I would have cleared the rock if it was not fitted, I do not know, but to shear off a grade 7 steel bolt and bend a 5mm steel bracket takes some force. I was worried about possibly cracking the diff housing so I have washed and dried the diff housing, rubbed talc powder over the exterior surface and then took for a 30 min drive, no sign of any leaking diff oil through the cast iron housing.

Will closely monitor this, whilst I price a replacement dampener and design a custom dampener.

Has anyone removed the dampener? if so any longterm effects?

cheers, old Jack.
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Last edited by old Jack; 11-11-13 at 07:16 PM. Reason: spelling
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Old 11-11-13
AndrewF AndrewF is offline
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G'day OJ,

I did the same thing, badly bent/twisted backwards and sheared the bolts off ages ago going over some rocky terrain (pre-lift) when the car was still quite new.

Mine was taken off as it was also pressing against the sway bar and I haven't bothered to replace it.

MMA have serviced the car since new and haven't worried about it and I haven't noticed any ill effects.

That was well over a year ago now and have forgotten all about it.

Cheers,
Andrew
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Old 11-11-13
BMN BMN is offline
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One of the first things i removed, 75000km and no dramas. I Reckon anyone that uses there challenger off road will find its full of stones/mud... 'BENT' etc and pretty much doing FA
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Old 11-11-13
MikeL MikeL is offline
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Surely it protects the swaybar and diff?
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Old 11-11-13
fester fester is offline
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If you want to keep it old jack, what about a tight fitting sleeve like bracket with a kicked up front to form a slider of sorts. Maybe braced back to a couple of the diff centre bolts. Those side bolts so close together are always going to cop a flogging.
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Old 11-11-13
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wasarangie wasarangie is offline
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OJ, A lot of owners have removed that dampener with out any bad reports so far. In the early posts (2010) there was talk about bending that part.

Mine has a few scrapes but no bending yet.
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Old 11-11-13
BMN BMN is offline
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Quote:
Originally Posted by MikeL View Post
Surely it protects the swaybar and diff?
No its a anti harmonic/vibration device. A lot of modern cars have such devices to 'theoretically' enhance you driving pleasure. Its been very very poorly located on the Challenger for anyone who goes off road. If your planing on doing some rock hopping unbolt it for the day
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Old 13-11-13
greig greig is offline
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Quote:
Originally Posted by BMN View Post
No its a anti harmonic/vibration device. A lot of modern cars have such devices to 'theoretically' enhance you driving pleasure. Its been very very poorly located on the Challenger for anyone who goes off road. If your planing on doing some rock hopping unbolt it for the day
I have done some serious rock hopping with mine ( have front locker as well ... plus bfg muddies and 2" lift ) and so far haven't damaged it.......maybe I've just been lucky..........but seeing this post, if I do damage it, it will come off ...
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Old 13-11-13
shortSteve shortSteve is offline
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Hey, i had a My12 Challenger that suffered horific body/driveline harmonics, one of the suggestions to see if it was rear driveline associated was to remove this thing. On my car (a five seat manual), driveline wasn't affected, but the "booming" noise through the rear cabin floor was amplifyed. It was soo bad i ended up doing a great trade with my prefered dealer. In short, if your car already has harmonic/vibration issues, it will be much worse without the dampener. If yours was ok before, it will almost definately be ok after removing.

sS
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Old 13-11-13
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Ballfyboy Ballfyboy is offline
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OJ, I ditched mine a long, long time ago (certainly before doing the lap) and I have not been able to discern any difference.

I agree it must do "something" but what? If it works so well why is it not on other vehicles?

Adding to OJ comments about weight, I also recommend that you do not have your face under it when you unbolt it, it is very heavy indeed.

R

ps greig you just need to go harder
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