F250 suspension...again!

Andymon · 06-04-2013, 03:32 PM

Well, I still have the "bounce" between 45 and 50.

I've had an alignment, tires rotated and balanced twice. Two alignment shops say it's gotta be the tires. they are basically brand new.

New shocks but no name on them...wondering if that could be the issue. Wheel bearings are fine as are the brakes.

Just don't feel I can tow until this issue is resolved.

The stiffness in the steering after having all four ball joints replaced seems to be getting better. Still doesn't come back to center all the way. Both alignment shops said that in some cases it could take a while.

tileman · 06-04-2013, 03:52 PM

Could you have a bubble on the inside of your tire.

I had it happen once in our 2008 dodge 3500 Had it in three diff tire shops and then I finally took it to a tire shop that dose big rigs and big tires and such only took them maybe 10 min after a test drive to find it.

Hope you can get it fixed soon.

Also it could be a drive shaft U joint had that happen on my GMC box truck.

Found this 10 pages might be worth a shot at reading http://www.ford-trucks.com/forums/10...40-45-mph.html

MarkS · 06-04-2013, 03:52 PM

Doesn't come back to center? That does not sound right.

Yak · 06-04-2013, 04:18 PM

Define "bounce'???

Andymon · 06-04-2013, 04:39 PM

Quote:

Originally Posted by Yak

Define "bounce'???

At about 45-47 the truck has a sorta shimmy but not a back and forth motion but more of an up and down..like having the palm of your flat out in front of you and just moving the fingers up and down.

Like this

Andymon · 06-04-2013, 04:41 PM

Quote:

Originally Posted by MarkS

Doesn't come back to center? That does not sound right.

It comes back but not all the way. I have to actually move the steering wheel. Stopped at another alignment shop tonight and they said the same thing. Sometime the ball joints just need to loosen up and in some cases it can take maybe 500 miles or even more. Moog joints so not the cheapies. One shop said it could be a bad ball joint even though it's new.

fla-gypsy · 06-04-2013, 05:06 PM

Quote:

Originally Posted by Andymon

At about 45-47 the truck has a sorta shimmy but not a back and forth motion but more of an up and down..like having the palm of your flat out in front of you and just moving the fingers up and down.

Like this

That is a wheel or tire issue.

Yak · 06-04-2013, 05:26 PM

Road force balance, could work wonders.

Andymon · 06-04-2013, 05:52 PM

Quote:

Originally Posted by Yak

Road force balance, could work wonders.

Not sure what that means....

B&T · 06-04-2013, 06:10 PM

Quote:

Originally Posted by Andymon

Not sure what that means....

http://www.youtube.com/watch?v=mjLJ1g_DQS4

sagebel · 06-04-2013, 07:06 PM

I would also agree with a wheel or tire issue. Have you tried rotating the fronts to the rear?

Jables · 06-04-2013, 07:23 PM

Torque converter shudder or misfire?

Bob Landry · 06-05-2013, 04:16 AM

You have a tire that the tread is separated from the casing. As you reach a certain speed, centrifugal force "slings" the tread away from the casing. If you just looking at the tire, it can look normal. I had this happen on a work van. My tire shop knew exactly what i was as soon as I explained what was happening.
The tire doesn't have to be particularly old for that to occur, it was just a bad tire.

jsmith948 · 06-05-2013, 05:16 AM

Steering not returning to center is NOT good. Have you had the steering box checked? Had a bad sector gear in a power steering box on a semi - acted like that

SAABDOCTOR · 06-05-2013, 05:31 AM

I AM leaning towards what bob is telling you. one thing is alignments do not cure vibration/shakes. As i do not do a lot of truck work except my own. i am no expert on fords. but steering wheel centering is a function of caster adjustment. If your camber is camber and or caster are off, Moog makes a "problem solver" ball joint that is adjustable. if you don't ask for them you won't get them the adjustment is made by removeining the greese fitting and inserting an allen wrench in the hole then turn the adjustment. they are not cheap but as far as tire wear and steering goes they are worth it. I have them on my Dodge. have your tire dealer check the tires fro ply/ bead sepperation. hope it all works out for you.

Andymon · 06-05-2013, 08:58 AM

I have had the tires rotated and balanced twice.

michael · 06-05-2013, 09:56 AM

Are your test with and without the trailer ? and did you test on different roads ? with same results ?

michael · 06-05-2013, 10:23 AM

My thoughts: week springs or cracked spring or springs or spring pins and or bushings, or like most are saying bubble in a tire. on the other pulling ? my ford suv had a slight pull, when I replaced the tires that solved that. now my pickup has a slight pull depending on the road but the pickup is also almost do for tires I will replace them with a E rated tire.
If your truck is bouncing because you have week side walled tires like a C or D rated then maybe you need to run E also.

Again all these are just off the cuff thoughts without seeing or knowing all the facts, Cracked cross member motor mount.

Good luck

michael · 06-05-2013, 10:28 AM

One more thought would a tire balance pick up if you had a few broken steel cords in your tire.

SAABDOCTOR · 06-05-2013, 10:43 AM

MOST TIRE BALANCERS DO NOT SPIN THE TIRE FAST ENOUGH. Sorry about the caps. one way we look for cord/ply seperation is to put the truck on a lift and run the tires at a fairly high speed and look for the shake. do you feel this bounce in the steering wheel or in the seat of your pants? any chance you have had the wheel flanges checked are they straight or bent? are your tires LT or car tires? good luck.

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