Re: Super Stock Springs Update

[Dave64 <lt7dave@xxxxxxxxx>]

I switched the driveshaft around - no change.  The brakes are ok - no draging.  I noticed the rear wheels are back farther than before - which got me thinking about the extended front hangers.  The driveshaft is back about as far as it will go to connect now.  So this appears to be at least part of the issue.  The pinion angle looks like it's about 0 degrees at the moment - so this could be another part.  The DC book says 5-7 degrees nose down - but I think that's more for racing.  About 3 degrees or so may be about right for the street?  What's the best way (tool) to accurately measure it? 

When I noticed the wheels are back farther, I thought about taking the 2" front hangers off and putting the stock ones back on.  This would move the rearend forward about 2".  If I push the driveshaft in all the way, I have about that much, so that might push it in to the max or close to it.  I don't know if that would be good or not.  If I go back to the stock front hangers, it may also push the nose of the pinion up more - going in the opposite direction of where it needs to go.  But then shims could correct that.  I think part of the issue is the 2" extended front hangers.  I think about 1" would be a happy medium - seems that 2" is too much, but stock is too little.  I could put the front spring eyes up in the upper mounting hole (they're in the lowers now), but I don't think that would change much.  Maybe it would?

At this point, I'm out of time.  My daughter is graduating from HS tomorrow, and I can't experiment any more today and also help get a party ready.  I'm disappointed that I won't get to drive the car to her graduation, but the weather may have eliminated that anyway.  Once we're past this weekend, I'll experiment some more.  I think my next move may be to put the stock front hangers back on and see what that does.

Thanks for the help, and keep the ideas coming.

Dave  

--- On Fri, 6/4/10, MO ( Steve Mick) <micher@xxxxxxxxxxxxxxx> wrote:

> From: MO ( Steve Mick) <micher@xxxxxxxxxxxxxxx>
> Subject: Re: Super Stock Springs Update
> To: 1962to1965mopars@xxxxxxxxxx
> Date: Friday, June 4, 2010, 5:37 PM
> 
> On ball and trunions and slip yokes. You must be sure that
> with car weight on the axels, that there is room for the
> drive shaft to be able to "give" frontward and backward.
> without bottoming out.  With slip yokes, if they are to
> close to the spline ends that will make the yoke loose and
> definatly make a viberation. Also if the yoke splines are
> worn and loose fitting, that will make a vibration. 
> Even brake shoe drag will make a vibration you would think
> was coming from the
> driveline...............................MO
> 
> {Steve Mick}
> http://www.1962to1965mopar.ornocar.com/mick64.html
> 
> ----- Original Message ----- From: "David Bailey" <bb64d440@xxxxxxxxxxx>
> To: <1962to1965mopars@xxxxxxxxxx>
> Sent: Friday, June 04, 2010 6:40 AM
> Subject: RE: Super Stock Springs Update
> 
> 
> 
> 
> 
> I’m no expert by far, but I’d be inclined to agree with
> your suspicions…that is 1. To check drive shaft length /
> straightness and what about the universal(s) joints / Ball
> Trunion, are these fresh? By a remote chance, maybe by
> simply rotating the drive shaft connecting point could
> restore smooth operation.   And 2. The pinion
> angle, someone else will know better but is the angle of 3
> degrees still a commonly accepted point?
> Dave B.
> 
> 
> > To: 1962to1965mopars@xxxxxxxxxx
> > From: lt7dave@xxxxxxxxx
> > Subject: Super Stock Springs Update
> > Date: Thu, 3 Jun 2010 20:42:04 -0700
> > 
> > 
> > After chasing after the correct brake setup, I have my
> '64 Belvedere all buttoned up and back on 4 wheels. Here's a
> rundown of what I did.
> > I installed a later model 8 3/4 rearend (I think it's
> a '68 B body). I used my old 741 third member, put new green
> bearings on the "new" axles, and put new brakes on it
> (11'x2"). I also installed 3400lb SS springs with the 2"
> extended front hanger brackets along with new (longer) Mopar
> drag shocks.
> > 
> > The result: I really like how it looks now, but it has
> a bad vibration starting at around just 20 mph. A few
> assessments I make are: the third member is my old one - I
> had no problems before, so I'm figuring that is ok. The
> axles look fine - don't appear to be bent or anything, so
> for now I think they're ok. No change in tires or wheels, so
> that shouldn't be it.
> > 
> > This leaves me with the theory that it's driveshaft
> related. Either the length of the driveshaft could be an
> issue (as suggested previously here), or maybe the pinion
> angle now isn't correct. Because I changed several things
> all at once, I've left myself in a position of having
> several possible areas that could be the problem. And I also
> didn't have the forethought of measuring the driveshaft
> length or checking the pinion angle on my previously
> non-vibrating setup, so determining if those things are at
> issue will be more of a challenge. I'm bummed out that I did
> a lot of work and now have a car that's essentially not
> driveable until I get this figured out and fixed. As always,
> your help is much appreciated. What do you guys think?
> > 
> > Thanks,
> > 
> > Dave
> > '64 Belvedere 2D HT, Auto
> > 
> > 
> > 
> > 
> > 
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> Please address private mail -- mail of interest to only one
> person --  directly to that person.  I.e., send
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> personal messages only to the intended recipient, not to the
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> privacy, reduce the total volume of mail and fine tune the
> content signal to Mopar topic.  Thanks!
> 
> 1962 to 1965 Mopar Clubhouse Discussion Guidelines:
> http://www.1962to1965mopar.ornocar.org/mletiq.html and
> http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.
> 
> 
> ----
> Please address private mail -- mail of interest to only one
> person -- directly to that person.  I.e., send
> parts/car transactions and negotiations as well as other
> personal messages only to the intended recipient, not to the
> Clubhouse public address. This practice will protect your
> privacy, reduce the total volume of mail and fine tune the
> content signal to Mopar topic.  Thanks!
> 
> 1962 to 1965 Mopar Clubhouse Discussion Guidelines:
> http://www.1962to1965mopar.ornocar.org/mletiq.html and
> http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.
> 
> 
> 
>