the front end should be sufficiently stable in its design so that normal road undulations dont cause unstable harmonics.
It is. Even with a lift and no geometry correction it is pretty stable. I despised my vehicle for a period of time but the reality was that neither I nor the mechanics up here were testing and therefore diagnosing problems properly. I have a 100% brand new (and apparently heavy duty) front end apart from wheel bearings and tyres - it drives fine. And that is lifted without any castor correction.
If it is wobbling or has even a light shimmy something is not right/working how it is intended.
It is. Even with a lift and no geometry correction it is pretty stable. I despised my vehicle for a period of time but the reality was that neither I nor the mechanics up here were testing and therefore diagnosing problems properly. I have a 100% brand new (and apparently heavy duty) front end apart from wheel bearings and tyres - it drives fine. And that is lifted without any castor correction.
If it is wobbling or has even a light shimmy something is not right/working how it is intended.
As you state your jeep has a heavy duty new front end.
This problem is more about the standard original equipment.
It should not need to be brand new, a reasonable service life should have been designed into it.
What castor angle does yours have with the lift?
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2001 XJ turbo dsl
I no longer question authority, I annoy authority. More effect, less effort.
it probably is reasonable if you drive like a nervous nancy and leave it totally standard. Mine is heavier than standard, I don't drive slowly and it was seeing more than just casual firetrail and beach work on weekends.
i have lifted it higher since the last time it had a measurement on a machine. it would be just below 3 degrees at the moment. specs from the manufacturer are as follows (thanks to AEV for the image)
Keep in mind that "death wobble " is a bit of a misnomer..... In reality its an oscillation of the axle/tyres etc. Its frequency dependant (happens at certain speeds) and usually (in my experience anyway) requires an impulse to kick it off.
And as any "death wobbler " will tell you it takes a substantial change in vehicle speed to stop the oscillation.
Not that this is a solution.... just if people are doing research its better to understand whats exactly happening. If you want a relevant area to research look up "castor shimmy " youve seen it on supermarket trolleys no doubt
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It seemed like a good idea at the time........
Last edited by MightyMouse; 26-03-2012 at 07:42 AM.
It is. Even with a lift and no geometry correction it is pretty stable. I despised my vehicle for a period of time but the reality was that neither I nor the mechanics up here were testing and therefore diagnosing problems properly. I have a 100% brand new (and apparently heavy duty) front end apart from wheel bearings and tyres - it drives fine. And that is lifted without any castor correction.
If it is wobbling or has even a light shimmy something is not right/working how it is intended.
With all due respect I totally disagree. Death Wobbles could be caused by one specific factor or a variety of factors. You need to go through a laundry list to eliminate all the issues that might cause a wobble.
I agree with layback40, this would suggest that the default situation is a Death Wobble and all the necessary precautions have to be in place to prevent it,.
I'm sorry but that is no way to design a car.
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With all due respect I totally disagree. Death Wobbles could be caused by one specific factor or a variety of factors. You need to go through a laundry list to eliminate all the issues that might cause a wobble.
I agree with layback40, this would suggest that the default situation is a Death Wobble and all the necessary precautions have to be in place to prevent it,.
I'm sorry but that is no way to design a car.
Aren't ALL cars designed like this? The parts only work when all precautions are in place.
With all due respect I totally disagree. Death Wobbles could be caused by one specific factor or a variety of factors. You need to go through a laundry list to eliminate all the issues that might cause a wobble.
I agree with layback40, this would suggest that the default situation is a Death Wobble and all the necessary precautions have to be in place to prevent it,.
I'm sorry but that is no way to design a car.
Well bad news you're going to have to sell your JK before it kills you because that's just how solid steer axles are.
How do you know they don't? No large internet forums with dozens of people complaining about it? hehe
Ive experienced DW in brand new 8x8 scanias.... the right bump at the right speed can set it off..... button off and it dissapears pretty quick though....
How do you know they don't? No large internet forums with dozens of people complaining about it? hehe
I have a Ford truck on the farm, no problems. I have had other ridged front end trucks & an earlier jeep (65) no problems. The later jeeps are very light in the front end, very flexible, probably the reason why there is a problem. its hard to avoid resonance when there is a lot of flex. Jeeps have very light UCA, LCA & panhard. plenty of flex so its not surprising that resonance occurs.
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2001 XJ turbo dsl
I no longer question authority, I annoy authority. More effect, less effort.
Be careful what you wish for. We may end up with a independant front end on the Wrangler.
Or if it is decided that aftermarket mods are causing the problems then it may give cause for regulatory authorities to tighten up even more on what we can do to our vehicles.
Hi all
my 2009 unlimited crd has now 110.000k on the clock, has travelled though out aus including the simpson, canning, kimberley, etc. shortly after buying i fitted an aev lift and while then they came with castor correction bolts i felt there was a little bump steer present ( i mean by this when i hit a pot hole the steering wheel would jar a little. no wobbles though) i purchased adj front trailing arms (superlift black diamond) and increased the castor to around 7 deg. no bump steer, no wobbles. standard panhard /track bar.
in the 110,000 k i have only had 3 wheel alignments the last at around 50,000k, an have very even tyre wear as you can see by my mileage of my first set of tyres,
my tyres from new have been bfg km2 muddies 285/70/17 from which the first set lasted over 90,000k.
from my recollection the aev kit did come with some different bolts to use, but also the reuse of standard bolts was also used in different places. of course alot of bolts were loosened and re tightened.
This post has just been some info for thought as i'm no expert, but i do believe maybe the castor has a large bearing on how unsettled the front end can become.
Its a pity that it had to come to this for Jeep. I Cant believe they didnt actually lift one during the R&D Phase of the JK, put some bigger tyres on it, reduce the caster to see what happened.
Maybe if they did, it would have been a better setup from the get go - if fact I bet it would have been.
This problem is perplexing as chrysler does not have a history of fixing any design mistakes in Jeeps as a priority. I have a KJ cherokee, since 03, but have often thought of getting a crd JK. I'll keep my eyes out for a solution but it doesn't appear to have just a single cause. This site also looked into the issue http://www.jeepz.com/forum/suspensio...s-how-fix.html
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