[thstone]

Actually, the 996 rear end should be solid as a rock - that is the advantage of the rear engine layout. The only time it should feel "loose" is during power-on oversteer or if you lift the throttle abruptly in the middle of a corner and unload the rear, then it will get loose and want to come around.

The best way to drive a 911 well is to use the fantastic rear end traction to advantage and get on the power much earlier in the corner than in a Boxster - a 911 is typically slow into a corner and super fast out of a corner.

I don't know what the GT2 spec alignment is but that might be part of the problem - maybe the GT2 alignment spec sets up the car such that the rear end will slide around and if you're not used to that characteristic or don't expect it, you may feel uneasy and have a lack of confidence in the handling.

Maybe try having the alignment set back to C2 spec and see if that helps. Otherwise, I'd ask the shop to check for anything else that might be worn that might be contributing to the issue.