shudder on a '57

[Philippe COURANT <accf_clb@xxxxxxxxxxxxxxxx>]

Today i was at a meeting with my Imperial; good test because i
drive 150 miles (3/4 on highway where i sustained a 70 mph
average speed).
I noticed some shudder or vibration of the car at a specific
speed: betwwen 40 and  45 mph ther's a vibration (even if i
release the accelerator). Above or under the car drives well.
i've seen in the manual that a propeller shaft shudder could
arise at some speed ( 15 to 20 mph). The adjustement isn't very
clear in the manual: measure a "working angle" then shim the axle
(but where ? behind the frame bracket struts or at the middle
joint center)

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Philippe COURANT (Pau, France)
Imperial 57 Crown convertible
Buick 58 Roadmaster sedan

- American Car Club de France (ACCF) : http://www.accf.com

- Chrysler Imperial France : http://www.ifrance.com/c-i-f

- Cadillac " Standard of Excellence " :
http://www.ifrance.com/accf-cad

- SportsCars : http://www.ifrance.com/accf-sprtcar