What do you mean by shuddering? Is the engine running rough at that speed or
is the front end shimming or vibrating?
I think from your description it is a tire problem. Have the tires computer
balanced. Misalignment does not usually cause a vibration, but worn front end
parts can. check the king pins, all the front end bushings and especially the
area where the bolts go throught the bottom of the king pin.
Maynard Hirsch
78B
67B
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