Urgent Help - those who have/install Rize 8 in -DEATH WOBBLE - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 15 (permalink) Old 08-31-2009, 02:41 AM Thread Starter
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Urgent Help - those who have/install Rize 8 in -DEATH WOBBLE

All-after amassing parts for a year, i finally got to install my rize 8 inch lift today. After a smooth installation (following directions exactly) i took the truck for a test ride. After a quarter mile, i hit a small bump and instantly the steering wheel shook violently and the entire truck started shuddering in the famed "death wobble." I had to slow to a near stop to get the truck back on track.

This continued to happen. A quick phone call to a trusted source recommended placing the Castor at -4.0 (says this is used on several newer trucks). Stock recommendations from the alignment machine are +1.4-+3.4. Has anyone else done this on their ride?

Does anyone else have recommendations? Whats interesting is that after removing the 39.5s and putting the stock tires back on, the death wobble decreased significantly. It was still there, but more managable.

Any ideas or input are greatly appreciated. Ill be back at it tomorrow afternoon. I am also going to try to get in touch with a Rize tech rep.

Thanks
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post #2 of 15 (permalink) Old 08-31-2009, 10:58 AM
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do you have a steering stabilizer installed?

they do help alot


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post #3 of 15 (permalink) Old 08-31-2009, 01:10 PM
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My post, copy/paste from your thread on another forum, in case you read here first.

Have you had it aligned with with the new tires on? My installers had a small issue of not being able to find the right style tool (for a couple of days) to fit on a rockstar wheel to get the alignment done. They specifically said it had to be done with the new tires on, and not with the old style rim & tire. It makes a difference in the alignment.

I would suspect that your wobble reduces with the stock tires because of the lack of alignment (or it being more-aligned toe-wise to your stock tires). After you get it lined up properly (toe for the tires, caster for the lift, basically), it should decrease quite a bit or ideally, disappear. Solid front axle trucks are VERY sensitive to proper geometry, so lifting it (no matter how good the lift) and not having it checked immediately, will have quirky handling. After you line it up, I would put on a dual stabilizer kit as well, but agree that you should have this straightened out as much as possible before hand.

Good luck... you'll get it straightened out!
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post #4 of 15 (permalink) Old 09-01-2009, 01:52 PM
 
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I personally don't have alot of experience with death wobble in Fords. I do with other straight axle four link front ends like Jeeps and Dodges. DW cna be caused by many things but assuming that you don't have any worn parts on you truck and everything is installed correctly I wouls look at caster and tires. What kind of tires are you running? Alot of DW can be caused by tires with weak sidewall contruction. Alot of the Dodge guys run it to problems when using BFG's and some Interco's. Also Did adjusted to the caster negative make it worse? Usually you would want you caster positive not negative. I have eliiminated DW in Jeeps and Dodges by putting the caster around 5 degrees positive.

Good luck and let us know what happens.

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post #5 of 15 (permalink) Old 09-01-2009, 02:19 PM Thread Starter
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I personally don't have alot of experience with death wobble in Fords. I do with other straight axle four link front ends like Jeeps and Dodges. DW cna be caused by many things but assuming that you don't have any worn parts on you truck and everything is installed correctly I wouls look at caster and tires. What kind of tires are you running? Alot of DW can be caused by tires with weak sidewall contruction. Alot of the Dodge guys run it to problems when using BFG's and some Interco's. Also Did adjusted to the caster negative make it worse? Usually you would want you caster positive not negative. I have eliiminated DW in Jeeps and Dodges by putting the caster around 5 degrees positive.

Good luck and let us know what happens.
Thanks for the response...ive been working with a few "techs" on the other site and they all came to the same conclusion, that i need to be in the +4-5 degree range if my pinion angle can handle it. I am running bias ply 39.5 inch iroks which could certainly be contributing to the problem, but i know a few others with the diesel are running these same tires without problems. Next set will be radial for sure (these were just a good deal). I am going back to the shop today to try to adjust to +4ish and im going to take for another ride. Hopefully it corrects. If not, ill try the other extreme of -4 and see how that does. If neither work, its stock tires back on, back to ford specs on caster then taking it home with the stockers and working on a solution from there.

THanks for the help. BTW-im only about an hour away in MI (if i ever get there!)
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post #6 of 15 (permalink) Old 09-01-2009, 09:04 PM
 
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????
Where do you live and where are you at now?

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post #7 of 15 (permalink) Old 09-02-2009, 02:29 AM Thread Starter
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????
Where do you live and where are you at now?
ypsi...but right now im in eastern PA working at my uncles shop. im trying to get home tomorrow...but thing havent been going well today. the adjustments we made ...made things worse
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post #8 of 15 (permalink) Old 09-02-2009, 10:32 AM
 
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Wish I had more time. I have been outside Philly for the last few days but I fly out tomorrow AM. I would have liked to see what you're experiancing and look at the install.

The more I thought about it, I would take a look at the lower control arms and make sure you didn't excede the 3/8" measurement they give you for the hiems. If they were too extended it would roll the axle a bit too far out from under the truck with the shortened up arms causing an undesired angle on both the coils and sway bar towards the front bumper. Don't ask how I know this...
post #9 of 15 (permalink) Old 09-02-2009, 07:58 PM
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How tight is your track bar? my truck did the same thing and I noticed it was the track bar. the bolt supplied in my lift was a little smaller than stock so if its not torqued to spec it can move slightly on the bolt and cause death wobble. With the truck parked have someone turn the steering wheel slightly side to side and see if the track bar moves in the mount, it wont move much but thats what caused mine.
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post #10 of 15 (permalink) Old 09-02-2009, 10:52 PM Thread Starter
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How tight is your track bar? my truck did the same thing and I noticed it was the track bar. the bolt supplied in my lift was a little smaller than stock so if its not torqued to spec it can move slightly on the bolt and cause death wobble. With the truck parked have someone turn the steering wheel slightly side to side and see if the track bar moves in the mount, it wont move much but thats what caused mine.
i retorqued today, but its tough to be sure you are at 400 ftlbs. I will check again first thing tomorrow.
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