Strange wobble intermittent

[schtick]

Hi everyone. Mabey someone could shed some light on this. Once in a while there is a violent wobble of the car. I can feel it in the shifter and see the shaker moving as well when the wobble occurs. The whole car shakes for a few seconds then it's gone. I drive this car a lot, and the problem is recent. Feels like when you get snow and ice in a rim and the car shakes from not being balanced. " Met a few of you at Carlisle this year" Here are some specifics. All rebuilt 440, 18 spline 4 speed, 3:54 Dana, Polyglas tires, hochkis quick ratio  idler and pitman, Bilstein shocks. I have checked the motor mounts, and the drive shaft. Seems to happen whenever I hit some bumpy parts in the road. Almost like the entire drive line is shaking.

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[Chryco Psycho]

My Guess is bad tires combined with bad shocks

[Cuda Cody]

   Tires and shocks would be the first place I would check.  As tires wear they can become unbalanced or go bad.  We have been going through the same thing with a newer car we own.  At about 5,000 miles the factory BF Goodrich tires started vibrating around 40 mph.  A re-balance fixed it for about 3,000 to 4,000 miles then it comes back.  I have grown to hate BF Goodrich tires now.  They keep going out of balance as they wear down.  We're at 24,000 miles now and I can not wait to get new tires. 

[MEK-Dangerous]

Is there a certain RPM range or speed where this occurs?

[Chryco Psycho]

BFGarbage are the worst junk out there .
Just stay away

[Brads70]

What about the lower/upper control arm bushings?

[schtick]

Hmmmmm. The thing that is very odd, is that it happened once the week before I drove from CT to Carlisle. Didn't happen again until this week. Would control arm bushings or tires do that intermittently? And litterly the engine and trans wobble in unison. Mabey a bad belt in a tire? But wouldn't that always be there? Speed or RPM have no influence. Car runs perfectly otherwise.

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[Chryco Psycho]

When Pixies tires went away it had a sweet spot where the shake would go away , maybe when both tires were opposite & it was not constant but when it was bad it was shaking the whole drivetrain too

[schtick]

Ok. Good info. I have a set of radials. I will put them on and see if the problem returns.

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[RUNCHARGER]

That's easy to try all right.

[schtick]

That's easy to try all right.

One thing I noticed today when it happened, I hit the brakes and it stopped the shaking. Thoughts?

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[dodj]

My first thought would be strut rods and/or tie rods. Did you try the different tires yet?

[1 Wild R/T]

That's easy to try all right.

One thing I noticed today when it happened, I hit the brakes and it stopped the shaking. Thoughts?

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Combination of things.... First tire/wheel balance & second worn steering linkage...

[MEK-Dangerous]

Well, at least we eliminated an unbalanced drive shaft.     

[schtick]

Hmmmmm, steering linkage. The problem started only after I installed the quick ratio pitman and idler. Car has factory power steering and everything is new or rebuilt. And I had it professionally aligned. I love the change.

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