Is the stub axle play in all planes or just back-front, up-down? You mention u-joints, they are true UJ's not CV joints correct? 3,000 miles isn't a lot, who rebuilt the transaxle previously and is there a warranty?
What angle do you have on you half shafts? I understand acute angles can be a problem with u-joints and that is why a lot of the GT40's are using CV joints that can tolerate more. Maybe that is putting excessive load on the stub axle.
Julian
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