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My FJ shudders at 75 mph

IronWing

IronWing

No Lifer
I just had new struts put on the front of my FJ Cruiser. Now I feel a shudder starting at 70 mph, peaking at 75 mph, and fading out at 80 mph (a hypothetical 80 mph, of course 😛 ). Any ideas on what would cause it?
 
I would start with rotating the tires and see if that makes a difference. You probably need to rotate the tires anyway. Let us know.
 
Aligning doesn't create a shudder. It will create a pull, or uneven wear, or too much wear. But I haven't had a shudder from alignment.

Make sure your tires are inflated properly. Then get them balanced. That's the most common cause of shudder.
 
It can most certainly create a shudder. Had that issue once with the Subaru where it had a shudder at highway speeds. Lower speeds was fine. Turned out the front toe was out of whack and was bad enough it ruined a tire.

Also had something similar with another car that was "aligned" (it drove straight) but had a shudder above 70 mph. Never got that one fixed but the next owner told me it was way off.
 
Amazing. I looked it up, and if the tires are far enough misaligned it can cause a shudder. But it's got to be a pretty bad misalignment to make it happen.
 
Toe isn't always obvious as the car can still track straight. The Subaru incident was a $1000 learning experience as I needed to replace the whole set. Now if something feels off it's straight to the alignment shop.
 
yeah if you can, while they're doing the alignment, check out the computer screen for the alignment. I took a car to a shop to do an alignment and made sure the steering was straight. I came by and asked them what was going on, they said they were almost done and I looked up and saw the steering wheel was still considerably off so I had to point it out to them and they then fixed it.
 
Yes, at bare minimum you should ask for the printout from the Hunter. I have my guy set zero toe front and rear. Usually manufacturers spec slight toe in which improves straight line stability.
 
Keep your eye on the lower control arm on these vehicles, they tend to have problems with rust and corrosion and often need replacing.
 
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