----- Original Message -----
Sent: Wednesday, July 31, 2002 10:43
AM
Subject: RE: [Chevelle-List] Help: Rear
end and driveshaft vibration probl em
I've
never done it before. I think I saw it in the chevy high performance magazine
sometime ago and maybe in a 4 wheel drive magazine talking about the
importance of the correct driveshaft angle. And probably on this list at
sometime or another. I believe ther is a magnetic mounted device to measure
the angles. I'll try and see if I can locate the article and scan it. I cant
promise that I'll find it though, but I'll try. Unless someone else on the
list has some other knowlege or article or input. There might even be somethin
at team chevelle in the archives.
Brian
Zack
'70 Chevelle Malibu
mailto:brianz@dpsabq.com
-----Original Message-----
From: Craig A. Ellis
[mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 31, 2002 10:16
AM
To: '[EMAIL PROTECTED]'
Subject: RE:
[Chevelle-List] Help: Rear end and driveshaft vibration probl
em
Brian,
Excellent
idea. I just saw that very suggestion in the Chevelles.net archive. I had
never thought of it before. Do you know how to set the angle? Is it
something you just "eyeball" or is there a methodology for setting it
correctly?
This is an
important one because the entire vehicle was removed from the chassis and
the rear end removed for restoration. It may have gone back in slightly off
the correct angle. And the fact is, I have no idea how to check
it.
Craig
Have you checked the pinion and driveshaft angles
so that the pinion to driveshaft and tranny to driveshaft angles are
equal? Were the rear control arm bushing bolts tightened with the
suspension loaded to maybe have an effect on this angle and/or possible
traction problems. Just some thoughts. I would definately check the
driveshaft angles though, Good luck.
Brian
Zack
'70 Chevelle
Malibu
mailto:brianz@dpsabq.com
-----Original
Message-----
From: Craig A. Ellis
[mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 31, 2002 8:43
AM
To: Chevelle (E-mail)
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
