is this death wobble??? - Ford Powerstroke Diesel Forum
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post #1 of 27 Old 04-10-2011, 01:48 PM Thread Starter
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is this death wobble???

first ford, but i have heard of this issue before.

background info:

i just switched out my kumho kl71's from my stock 18's back to the stock conticraps as i want to get a bit more out of them before i order duragrapplers or crossteks.

i have 1 spare rim up front and the other is the stock aluminum (hit a curb and cracked the rim in march snow plowing) i am ordering a set of xd's soon.

anyways, i was driving down the highway at approx 65mph around a bend and hit a bump and the truck goes nuts with vibration that lasted a good 5-10secs as im trying to slow down. the whole truck is filled with a higher freq. vibration and im trying to hold the wheel. it only stopped after i got it down pretty slow.

i have never experienced this before and it happened 3 times that night. the last time it happened i hit a bump and the vibrations started small and went really bad then stopped again.

ive driven this stretch of highway hundreds of times before and never had it happen on the conti's or any other time before.

could it be a badly balanced tire? but normal driving i dont feel any symptoms of an unbalanced tire. is it that i have 1 steel 18" spare rim and 1 oem aluminum rim and the uneven weight was causing crazy axle bounce?
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post #2 of 27 Old 04-10-2011, 01:52 PM
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I'd jack the front end up and see if you have any play in any front end components. Your different size tires may be causing the problem but I don't think it would. Did it start immediatly after you put that wheel on?

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post #3 of 27 Old 04-10-2011, 02:02 PM Thread Starter
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all 4 tires are the same size. they are the stock continentals that came on the truck. i only run the kumho's in the winter and this has never happened with either set of tires before.

the only thing that has changed is that im using the spare rim which is still the same size (18") as the other rims.

edit: this is on my 09 6.4 truck. crew cab, long bed.
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post #4 of 27 Old 04-11-2011, 05:38 AM
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do you have a lift or the stock suspension?

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #5 of 27 Old 04-11-2011, 06:46 AM Thread Starter
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suspension is completely stock except that I have AA code 7,000lb springs up front

gonna jack it up today, check for loose parts and air down the tires to around 60psi up front and see what happens.
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post #6 of 27 Old 04-11-2011, 01:47 PM
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Ive seen this a couple of times including my own truck with stock suspension. All my ball joints were tight, rod ends good and steering box okay. Turned out to be the track bar bushing on the driver side where it connects to the frame bracket. I replaced mine and it was solved. You can check it by having some one turn the wheel all the way to the left and then back and fourth. If you see too much movement or pop sound replace it. It cost me 19 bucks, I installed. Not saying its the problem, just the easiest to check and I think the first crappy part to wear out. These bushings see alot of lateral load during low or no speed turning of the wheel.

2008 F250 CCSB Lariat Sterling Grey, DPF/DOC Delete, KEM 345 tuned SCT Livewire, 4" DP back Magnaflow, 2.5" level w/ 5"blocks, Amsoil BP Oil Filtration System, S&B intake, BD Cold side Pipe
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post #7 of 27 Old 04-11-2011, 03:21 PM Thread Starter
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well, i jacked up the front end and checked for tie rod play and hub/joint play and found none. I aired down all 4 tires from 70psi to 60psi and took it on the highway for an errand and it did it again. I was driving 65mph and it stopped after I slowed down to 50mph.

our 6.0 should be done getting built on thursday so im dropping off my this 09 to get the continental recall done for these crap tires. Ill check out my track bar bushing and have my guy look into it if it is loose, thanks for giving me that heads up Bowkill!
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post #8 of 27 Old 04-11-2011, 05:00 PM
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my moms durango did something simillar to this when the front shocks went out and everything felt fine, but we did them sincfe the back ones started leaking and it fixed the problem

2001 f250 lariat 7.3 3.73 rear end 4" exaust with muffler-5"tip eagle alloy rims with 305/70 firesteone at, superchips programmer

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post #9 of 27 Old 04-12-2011, 12:13 PM Thread Starter
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so i checked for play in my trackbar at the bracket and did notice a bit of movement. im goin to swap out the bushing anyways.

does anyone know if theres an energy poly bushing available or something better than stock? truck plows so im sure thats where alot of the wear came from. 09 with 51K
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post #10 of 27 Old 04-12-2011, 05:13 PM
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I looked high and low and couldnt find anything. I was about to buy a universal track bar bushing from Energy Suspension and machine it to fit and then figured the exrta hassle wasnt worth it. Mine also went south at 50,000 so if I replace it in another 50k thats okay. It only took me 45 min and 6 beers. One thing I realized is that if I limit the amount steering at no movement, the stress on the bushing is reduced.

2008 F250 CCSB Lariat Sterling Grey, DPF/DOC Delete, KEM 345 tuned SCT Livewire, 4" DP back Magnaflow, 2.5" level w/ 5"blocks, Amsoil BP Oil Filtration System, S&B intake, BD Cold side Pipe
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