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Man, that sounds
just as plausible as the pinion angle thing. drop me a note and let me
know if your solution works. I've been eyeballing the bushings on mind with
suspicion but have been hoping to avoid the expense this summer. I bought a
magnetic protractor last night and am planning a trip to my mechanic at
lunch.
Craig
Craig,
I have a similar problem with my 67 SS. I think
it's caused by worn, original bushings on all the trailing arms. The
vibration starts around 60 MPH. It feel strange and I think it's the rear
end rocking side to side on mushy bushing. I'm in the process of changing the
arms and bushings now, so I don't know for sure if that's the source of the
vibration problem. But with the shocks and springs out, I can twist the rear
very easily.
Mike
----- Original Message -----
Sent: Wednesday, July 31, 2002 10:43
AM
Subject: [Chevelle-List] Help: Rear end
and driveshaft vibration problem
Hello again, fellow Chevelle owners. I
had to unsub for a while due to vacation and some seriously pressing
business, etc. Anyway, I've been vexed with a serious driveline vibration
this summer that is defying all of my attempts to fix. It begins in fourth
gear around 2600 RPM and increases in intensity up to 3200 where it smooths
out because the frequency is so high by then that it is not so annoying. My
speedo is out at the moment so I don't know the MPH but the vibration does
NOT change if I downship to third. Thus, I believe it is driveshaft and
rear-end related. It is vehicle speed related, not engine
speed.
I've installed a brand new
stainless steel driveshaft (from CCI in Detroit) and ujoints, double checked
it for runout (it's perfect), installed a new pinion flange (again, from
CCI), and I already had a new ring & pinion and new Moser axles. The
trans has been rebuilt and seems perfect. The motor seems well-balanced and
the front end components are tight (it does not feel anything like a
front-end problem anyway - it's not a shimmy, etc., it is a vibration you
feel in the seat of your pants as well as the steering wheel). I even have
new Edelbrock wheels (409's in 17x8) and BF Goodrich g/Force KDW's, but
there was no change in the vibration from my old stock SS wheels and
old-fashioned meats. BTW, you can see a pic of the car (unfortunately, with
the old SS wheels) at www.neagroup.com/chevelle.htm.
Everything I've tried seems to have
improved the problem in steps. The most recent trick is I flipped the
driveshaft and it got a wee bit better but still no joy. The pinion flange
made a big difference, as did the driveshaft. But it is still not smooth
enough to cruise the expressway at 65 without aggravation and
worry.
I am open to any ideas any of you might
have. I am at a loss as to what to do next.
Craig Ellis
Port Huron,
MI
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