F550 Body Roll - Diesel Forum - TheDieselStop.com
1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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post #1 of 2 (permalink) Old 12-21-2018, 03:53 PM Thread Starter
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F550 Body Roll

Purchased a 06 f550 for the farm and have had issues trying to figure out why there is so much sway in the truck. Originally I thought it just needed a set of new tires so went out and purchased some new 14ply from local big rig shop. Still has the sway after that buy. Since I have brought it to three different shops ranging from mechanics to alignment and suspension shops with no luck. I bought this truck to keep the heavy hauling off the F350 but this thing is so sketchy I do not truck it to put a load behind it.. Any thoughts??????????
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post #2 of 2 (permalink) Old 12-21-2018, 11:30 PM
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Are you referring to the wiggle around in a lane that makes it feel like the truck is on grease?

It is very common on F450/550. My 06 has had some degree of it since I got it with 1500 miles on it 11+ years ago. Different tires from different makers has not fixed it but it was best on Sumitomos. Worst on Continentals and in the middle with Michelins. It is fine with a heavy trailer in tow. It has been aligned several times and toe-in has been altered far from spec in attempts to make it better. Air pressure makes some difference. I slotted holes in the radius arm to give it more caster and that made little difference. It is best when the tires are near slick.
I have been in the vehicle fixing biz for 42+ years with more than two decades working for a car manufacturer in field tech support, I fix hard to fix hard to diagnose vehicles for a living and this problem is on a short short list of problems I could not resolve. A friend is a shop foreman at a big Ford dealer in truck dept and he says it can be improved but not fixed and that is where I'm at. I dare not sip one teaspoon of alcohol and ever drive this truck with no trailer as it wanders around like a drunk is driving it.
The rear end has slight toe-in, .04 degree. My Ford buddy said that is well within range and he put a rear axle housing in a truck that had 3 times what mine has and it made no difference.
I have even used a chain on the hitch attached to building frame and had two Big guys alternately step on the chains and looked and felt for leaf spring bushing lateral yield. Did the same type test for front to see if the panhard rod ball joint or bushing had deflection that couldn't be detected by pry bar loading. This has been ongoing for 145,000 miles but I still have found nothing that makes this truck walk around unloaded like it does. I will say that I have gotten used to it and I quit fighting it and that has been the only workable solution. This topic has been discussed on this and other forums for ford trucks and for other similar medium duty solid axle trucks.
Oh, and they don't all do it....
If someone has a fix I'd love to hear it.

2015 F350 Platinum Max Tow What a beast with the 4.30 gears!
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35+5 foot double tandem axle flatbed trailer.
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2004 Volvo V70R AWD-high miler in fleet, 253K (no engine repairs) Hail totaled it but I kept it. Looks like a golf ball now.
Suzuki Carry KEI truck, 660cc 3 cyl DOHC EFI 4X4 5 speed RHD. Sort of a Smart Car sized pickup. Eats Gators and Mules for lunch.
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