<VV> Jacking the Power Train

[Smitty Smith]

    : Sun, 20 Apr 2008 12:39:14 -0700
From: Chris & Bill Strickland 
Subject: Re: '64 Rear Suspension
To: Ron 
Cc: virtualvairs at corvair.org
Message-ID: <480B9BE2.9060605 at earthlink.net>
Content-Type: text/plain; charset=us-ascii; format=flowed

Ron wrote:

> You can't compare the '64 leaf spring force on the differential with 
> the jacking load on the differential as the latter is much greater 
> than the spring force. There's no comparison ...
  ------------------------------------------------
au contraire, Ron -- very comparable -- same relative magnitude (powers 
of ten), lifts the car three to five inches, and it is continous, 
applying that force anytime the wheels are touching the ground, so as a 
time related force (Click to see the LaTeX code for this image 
  Bill
  ------------------------------------------------
  Smitty Says:  Bill you are not aware of, or are ignoring one important point against your argument.  When the change to the transverse spring was made in 64 it was part of a complete package which included new design front mounts.  These mounts have a raised biscuit of rubber on top which rests against the inside of the top of the rear cross member.  That is about all that prevents the constant reversal of forces (up and down) on the mounts from tearing the rubber out.  So now you have the lifting force of the transverse spring against the bottom of the diff and you want to stick a jack under there and add to it.  When I am knocking off 125 mph I don't want to think about a cracked bell housing added to the other sins I have commited against my antique iron.YMMV