I've been chasing some handling problems with my 1979 Corvette for awhile now (car randonly wanders during freeway driving, requiring continual steering input to maintain centered lane travel). Even though it's only got about 45,000 miles, I've rebuilt the front suspension with new balljoints, tie rod ends, idler arm. Also had the steering mechanism checked and adjusted. I'm now focusing on the rear suspension. With the rear tires off the ground, by applying hand pressure I'm able to create noticable movement at the top of the tire. It appears that the axle shaft have about an 1/8" of in-out movement where they enter the differential housing. Is this movement normal? Is there a specified clearance for this movement? I'm guessing this might contributing to a camber change in the rear tires while driving. Anyone have any similiar problems, observations, or knowledge to clear up this question? Thanks for the help, Craig.