Rear differential lock always on

Radek radek at
Sun Apr 25 12:34:03 PDT 2010

Car is a 1988 90Q.  A question I couldn't find the answer to in the Bentley:  is the rear differential lock actuator on when pulled or when pushed by the vacum thingy?  The car has a shudder coming from the rear end when turning at slow speed.  At highway speeds, no issue.  

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