vibration/shudder at 70 - possible alternatives (other than wheel balance?)

[txrocco@sbcglobal.net (Patrick Bureau)]

Nope it did this with spider wv 13" , with Konig;s
15x7 with new rubber, and still doing it with
speedline 14" with new rubber as well... 

it is not a tire/rim related issue I am pretty sure of
it, Oh yeah add change bearings, cv joint, shocks and
springs, ball joint and tied rods...

I am thinking that it could be the sway bar bushings
or the a-arms bushings that need to be changed (small
bumps would cause because of deterioration of the
bushing a "loose" vibration....

I have the same problem on the prowler and I will know
soon anought as I change the bushings for poly's on
a-arms, and new sway bar bushings (oem)...



--- Rhett Farnum <rocco_crossing@hotmail.com> wrote:
> HOw about flat spots? I have at least one tire with
> a flat spot on my Cut' 
> and she likes to shake between 76-80mph. Just a
> thought.
> 
> 
> 
> Peace Out,
> Rhett
> Rocco_crossing
> '83 Rocco (autocross ready, tune up, harness bar,
> rear wheel bearings, and 
> finally I may get to makeing it look better!!)
> 
> 
> 
> 
> 
> >From: "Allyn" <amalventano@sc.rr.com>
> >To: "scirocco list" <scirocco-l@scirocco.org>
> >Subject: vibration/shudder at 70 - possible
> alternatives (other than wheel 
> >balance?)
> >Date: Mon, 21 Apr 2003 20:28:24 -0400
> >
> >ok, the rieger has had the same shudder at 70ish
> for the longest time.
> >
> >things changed:
> >a-arms, bushings (all), bearings (all), half shafts
> (replaced with a
> >questionable set), engine/tranny, engine mounts,
> and a totally different 
> >set
> >of wheels. not to mention rotors and hubs (i think
> this covers just about
> >every moving part).
> >
> >...and yet i still get the shudder...
> >
> >exact symptoms:
> >
> >- 0 vibration felt in wheel, even with the shudder
> at its worst.
> >- alignment is close enough such that it couldnt
> cause a problem like this
> >- shudder is not constant, the vibration is
> consistent with wheel rotation
> >at 70 mph, but it comes/goes at a 1 second cycle
> (kinda like its amplitude
> >modulated).
> >- shudder seems proportional to throttle
> application. the other day i did
> >several runs on the highway, coasting from 90-60 in
> neutral, and the 
> >shudder
> >seemed to go away. shudder returns when holding
> speed at 70, and gets worse
> >under acceleration.
> >- feels like an out of balance wheel, but i've also
> felt the same feeling
> >when i had a bad inner cv (however the bad inner cv
> had a constant
> >vibration).
> >- also seems like bad inner cv in that its almost a
> side-to-side vibration,
> >felt in the floor under the center console.
> >
> >possibilities:
> >1. other set of half shafts (rebuilds from
> potterman) had the exact same
> >problem with the inner cv.
> >2. frame/engine is misaligned such that one of the
> half shafts is at its
> >compressed limit when installed / car on ground.
> possibly forcing tranny
> >over as it rotates, causing the vibration.
> >3. both sets of wheels/tires have had the exact
> same imbalance, after being
> >balanced several times between both sets
> (doubtfull).
> >
> >suggestions???
> >
> >(thx in advance for info)
> >Al
> >
> >
> >_______________________________________________
> >Scirocco-l mailing list
> >Scirocco-l@scirocco.org
> >http://neubayern.net/mailman/listinfo/scirocco-l
> 
> 
>
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