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Re: Rear End Twitches

To: Jerry Causey <reecau@whidbey.com>
Subject: Re: Rear End Twitches
From: "W. R. Gibbons" <gibbons@northpole.med.uvm.edu>
Date: Tue, 1 Jul 1997 10:16:09 -0400 (EDT)
On Sun, 29 Jun 1997, Jerry Causey wrote:

> I rebuilt the rear leaf springs on my '67 MGB GT a couple of years ago, and 
>in 
> the process, modified the rear geometry, a la Fred Puhn (How to Make Your Car 
> Handle). They are de-arched, with extended rear hangers, and Koni tube 
>dampers. 
> This left the rear sitting a bit over 1 inch high. I just recently bought and 
> installed a set of 1.25 inch lowering blocks which levelled the rear of the 
>car 
> perfectly, but introduced a very unsettling movement of the rear end. When I 
> suddenly let off, or jump back on, the throttle the rear end twitches (to one 
> side off, other side on). Nothing appears to be loose or incorrectly 
>installed. 
> Could this be due to the change in pinon angle caused by the lowering blocks, 
> and will shimming one end of the blocks to restore the original angle 
>eliminate 
> the twitch? Any other suggestions for a cure?
> 

I suggest you tighten up the U bolts that hold the rear axle to the springs.

   W. R. Gibbons  Dept. of Molecular Physiology & Biophysics
                  Univ. of Vermont College of Medicine, Burlington, VT
                  gibbons@northpole.med.uvm.edu  (802) 656-8629


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