E350/E450 Handling Problems are caused by too little + CASTER

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SoloRover

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Mar 1, 2021
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Las Cruces, NM 88005
SoloRover: The tire wear shown is very excessive and there is no indication of a cause for that wear in the front end before alignment numbers. So, it may be the problem is with the rear axel being out of alignment. If the rear axel alignment is dog tracking it should be apparent in the rear view mirror while driving down a road that has line marking. IMO.
Thanks, Harvard. You might be into something here. I am reading on it, will check while driving in a couple of days, and I'll ask the shop that made the alignment if they noticed (they didn't share anything with me).
Questions:
1. Shouldn't this be apparent to the shop when doing the front wheel alignment?
2. Is it correct that there is no alignment needed for the rear wheels in this E450?
3. Can dog tracking be due to weight distribution or overloading or maybe suspension failures or is it because of a bent frame?

 

TheBar

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On a E350-450 or any vehicle with a fixed rear suspension dog tracking is usually caused by worn or missing bushings in the rear suspension or broken or damaged parts. If severely over loaded on one side it is possible the frame could flex to that degree but you would likely notice a big problem when driving. The steering wheel centering is not a reliable measure since it is easily changed when adjusting the tie rods during alignment.
 

Harvard

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Feb 14, 2011
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The Thrust Line is part of a four wheel alignment and not derived from just a front end alignment. It would be very unusual to have the E450 solid axel skewed but there have been RV past posters that claimed to have had the experience. I am troubled with your excessive tire wear and grasping at straws as to the cause when the front end toe looks to be neutral.
 

SoloRover

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Mar 1, 2021
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Location
Las Cruces, NM 88005
The Thrust Line is part of a four wheel alignment and not derived from just a front end alignment. It would be very unusual to have the E450 solid axel skewed but there have been RV past posters that claimed to have had the experience. I am troubled with your excessive tire wear and grasping at straws as to the cause when the front end toe looks to be neutral.
None of the photos I posted reflect the toe condition before I went to the shop. I was told the toe was adjusted to neutral as you see from my photos. Attached is my current reading, thanks to your instructions. BTW, the RV doesn't dog tracking. I watched it today carefully. Straight like an arrow from front to back.
 

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SoloRover

Member
Joined
Mar 1, 2021
Posts
6
Location
Las Cruces, NM 88005
On a E350-450 or any vehicle with a fixed rear suspension dog tracking is usually caused by worn or missing bushings in the rear suspension or broken or damaged parts. If severely over loaded on one side it is possible the frame could flex to that degree but you would likely notice a big problem when driving. The steering wheel centering is not a reliable measure since it is easily changed when adjusting the tie rods during alignment.
Thank you for the feedback! I'll check it when I get a chance as I had an issue with my suspension before. See details here.
 

Harvard

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Feb 14, 2011
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"None of the photos I posted reflect the toe condition before I went to the shop."

oops, my bad. I thought the photo was a before alignment. Disregard my thrust line problem references.
 

j2048b

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Apr 26, 2021
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cali
where can i get these bushings? i cannot match a set for a ford chassis 2017 (jayco 29mv 2018)
 

TheBar

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There was a link on page 6 of this thread from Harvard on Nov 1, 2018 to irv2 forums. On irv2 they showed the Ingalls 394 bushing was replaced by the Moog K8986 part number. You may want to follow that link yourself.

That part is listed on rockauto.com for the 2017 E350 and E450 chassis. RockAuto says it will fit your RV but I have no idea whether it will or not. Since you need 2 @ $1.78 each you won't be out too much money if you take your RV to an alignment shop and find out it doesn't fit. At the link below go down to "Daily Driver" and Moog K8986 is the first part listed.
MOOG K8986
 

j2048b

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Apr 26, 2021
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cali
There was a link on page 6 of this thread from Harvard on Nov 1, 2018 to irv2 forums. On irv2 they showed the Ingalls 394 bushing was replaced by the Moog K8986 part number. You may want to follow that link yourself.

That part is listed on rockauto.com for the 2017 E350 and E450 chassis. RockAuto says it will fit your RV but I have no idea whether it will or not. Since you need 2 @ $1.78 each you won't be out too much money if you take your RV to an alignment shop and find out it doesn't fit. At the link below go down to "Daily Driver" and Moog K8986 is the first part listed.
MOOG K8986
thank you, i appreciate it...unfortunately only 1 left on rock auto, weird they are so cheap there... actually found these ones thru amazon as well but like 20 a pop...
Specialty product company part 23187 or 23188 (LINK). It can also be found from the link mentioned by TheBar posted above. Good luck!
thank you as well, if i dont grab the moog ones ill get these appreciate it!
 

SoloRover

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Mar 1, 2021
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Location
Las Cruces, NM 88005
FWIW, the lower cost ones are adjustable single axis. The higher cost two axis adjustable allows you to set caster and camber within the limitations of the combined bushing and sleeve. Here are some examples:
  1. SPC794 (SPC PN 24180) equivalent to the Ingalls (LINK)
  2. MOOG Caster/Camber Adjusting Bushing (LINK)
  3. Moog K80109 Caster/Camber Adjusting Bushing (LINK).
  4. "OP Harvard's choice" - 59400 ingallseng (LINK)
I hope Harvard will step in and give his take on the value of adding two axis vs. one axis
 

Harvard

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Feb 14, 2011
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217
The only advantage I can see is the two axis is universal and probably easier to source.
 
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