Rear Suspension Ride Height

Yeah, my memory failed me. The 1974 manual describes how to prepare the car (full tank of fuel, etc), then says:

Measure shortest distance from highest point on underside of rear axle bumper strap (at rear of bumper) to top of axle housing.

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However, it doesn't give a specification other than the left and right should be within 3/4 inch of each other.