death wobble with 35s why
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Laughing Gas
Joined: Mar 2005
Posts: 765
Likes: 1
From: ct
death wobble with 35s why
I cant seem to figure out why im getting death wobble with only 35s on my 96 f 250.the tires are balanced.when I hit a pot hole my tires will keep shaking and so does the steering wheel until I put the brakes on to stop it.it has a straight axle conversion with king pins..i put on a new tie rod assembly connecting tie rod and right tie rod and its still doing it.i put the stock tires on and it does it with those toand those are balanced.im not sure why the the heck evertime i hit a hole in the road my steering and my wheels shake like crazy until I step on the brakes.anyone?
Post Fiend
Joined: Jul 2006
Posts: 6,948
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Has got to be leafs right? This one should be pretty easy.
Did you perform a shackle reversal? Is the shackle still at the front of the leaf?
Did you install a trac bar back in the thing if you did not perform a shackle reverse?
For some reason these trucks wobble like crazy if the stock front swing shackle is left alone, and not converted, and the trac bar is left out.
Did you perform a shackle reversal? Is the shackle still at the front of the leaf?
Did you install a trac bar back in the thing if you did not perform a shackle reverse?
For some reason these trucks wobble like crazy if the stock front swing shackle is left alone, and not converted, and the trac bar is left out.
Senior User
Joined: Sep 2003
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It shouldn't be due to tires that small, I'd take it to an alignment shop and have them take a second look. I'd expect a worn component.
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Post Fiend
Joined: Jan 2004
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From: Elkhart IN
X whatever on the shackles. Fords stock shackle setup allows lateral movement to a point to accomedate for the arc of movement from the ttb. If this isn't the issue, then I would look towards the kingpin preload springs. If the axle isn't rebuilt, it may be time for new ones, or if they are new, you may have to shim them some. I wouldn't think this is the problem though, since it did it with the stock sized tires also.
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Thread Starter
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Laughing Gas
Joined: Mar 2005
Posts: 765
Likes: 1
From: ct
nope it does not have a shackle reverse and yes it has the track bar with new bushings.the king pins are about a year old maybe a little older.as far as the axles im guessing there from 89 the year of the axle but im not really sure since i bought it used.it has leafs not coils.
Lead Driver
Joined: May 2000
Posts: 9,236
Likes: 12
From: Senoia, GA
this is one of kingpins flaws!
my white truck was getting DW real bad with 33 BFG k/m's and i couldnt figure out what it was. i tore the truck apart trying to fix it. finally came across some posts over on pirate about sliding 3 or 4 bumper washers on top of the KP spring to tighten it up. well it fixed it immediately. never had the first problem after that even after all my mods... 39 iroks, skyjacker lift springs, homemade shackle reversal and no trac bar. this was on a 1988 D60 KP dually front.
here is some good info...
http://www.pirate4x4.com/tech/billav...pin/index.html
-cutts-
my white truck was getting DW real bad with 33 BFG k/m's and i couldnt figure out what it was. i tore the truck apart trying to fix it. finally came across some posts over on pirate about sliding 3 or 4 bumper washers on top of the KP spring to tighten it up. well it fixed it immediately. never had the first problem after that even after all my mods... 39 iroks, skyjacker lift springs, homemade shackle reversal and no trac bar. this was on a 1988 D60 KP dually front.
here is some good info...
http://www.pirate4x4.com/tech/billav...pin/index.html
-cutts-
Senior User
Joined: Nov 2005
Posts: 101
Likes: 0
From: Monroe City, IN
I had the same problem on my 80 F-350 that believe it or not had a D50 TTB, I swapped it out for a new set of 4 inch springs and a D44 strait axle. After I got it done and got the steering cobbled up I took it down the road and I hit a bump it felt like the front end was coming out. It's happened to me once and I don't know what caused it.
Thread Starter
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Laughing Gas
Joined: Mar 2005
Posts: 765
Likes: 1
From: ct
Originally Posted by fishmanndotcom
this is one of kingpins flaws!
my white truck was getting DW real bad with 33 BFG k/m's and i couldnt figure out what it was. i tore the truck apart trying to fix it. finally came across some posts over on pirate about sliding 3 or 4 bumper washers on top of the KP spring to tighten it up. well it fixed it immediately. never had the first problem after that even after all my mods... 39 iroks, skyjacker lift springs, homemade shackle reversal and no trac bar. this was on a 1988 D60 KP dually front.
here is some good info...
http://www.pirate4x4.com/tech/billavista/PR-Kingpin/index.html
-cutts-
my white truck was getting DW real bad with 33 BFG k/m's and i couldnt figure out what it was. i tore the truck apart trying to fix it. finally came across some posts over on pirate about sliding 3 or 4 bumper washers on top of the KP spring to tighten it up. well it fixed it immediately. never had the first problem after that even after all my mods... 39 iroks, skyjacker lift springs, homemade shackle reversal and no trac bar. this was on a 1988 D60 KP dually front.
here is some good info...
http://www.pirate4x4.com/tech/billavista/PR-Kingpin/index.html
-cutts-
Senior User
Joined: Nov 2005
Posts: 342
Likes: 0
ive had this same sorta problem with my 91 f350 with 38.5" tires, but mine would just get a real bad wobble to the point it was undriveable around 40ish, speed up to like 50 and it was driveable but still shaky, but trying to cruise at 40ish was horrible!! had to drive under 40 or above 50,lol! i got the truck used it has 6" susp lift and 3" body, i put 285/75/16's on and the problem went rite away, i dont think the 38's are balanced and im gonna get them balanced and see what happens, but whats the deal with these " king pins" im new to lifted trucks and all how do i check to see if thats bad and were are they at?? but would i have a king pin or any other susp issue if i can drive fine with stock size tires and just not the big tires or sound like a balancing issue??
Senior User
Joined: Sep 2006
Posts: 439
Likes: 0
From: Connecticut
Originally Posted by 87wreckerman
ive had this same sorta problem with my 91 f350 with 38.5" tires, but mine would just get a real bad wobble to the point it was undriveable around 40ish, speed up to like 50 and it was driveable but still shaky, but trying to cruise at 40ish was horrible!! had to drive under 40 or above 50,lol! i got the truck used it has 6" susp lift and 3" body, i put 285/75/16's on and the problem went rite away, i dont think the 38's are balanced and im gonna get them balanced and see what happens, but whats the deal with these " king pins" im new to lifted trucks and all how do i check to see if thats bad and were are they at?? but would i have a king pin or any other susp issue if i can drive fine with stock size tires and just not the big tires or sound like a balancing issue??