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Last summer I rebuilt the rear axle on my cabriolet due to a chipped ring gear. I worked on it a few hours each day and it took me 2 months! Joe K has made an excellent reference to Tom Endy's rebuild paper of 2013. It is 65 pages long with excellent pictures! Part of this rebuilding process is establishing a preload on the carrier bearings in the rear end. When you put the two axle housings on the banjo, you must have enough gaskets/shims between the housing and the banjo on both sides to achieve this loading on the bearings. If too tight, you could be locking up the bearings and too light, the axle shafts would be moving in and out as you describe. As it turns out, my cabriolet required 0.025 thickness of shims to get the light loading on the bearings. Rebuilding a rear end is not for the feint hearted. I would go as far to say, "do not open up a rear axle unless there is something drastically wrong." A leak of 600W is not a good reason. In your case, if this in and out movement is slight and there is no noise, I would leave it alone.