Not sure all the reasons they replaced just that the warranty notes say that first gear was making a loud whining sound. Good ol BMW replaces tranny's instead of repairing them. That was the first owner that got it done. He sold it at 48k miles and then I got it from that owner at 89k.

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2001 E53 X5 3.0 Auto. Silver Black Build date 10-17-2000 141kmiles

2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles