My front drive shaft went at 115,000 miles. I didn't listen to my X5; it was making a clanking sound only when I put it in drive or reverse. The warning "clank" went on for about a month or so...then one day, while turning off the freeway offramp and slowing down before a stop light, things just went south. Luckily it did not happen while on the busy freeway.

Extremely Loud gear grinding noise and vehicle became immobilized. Engine runs find but no power to the wheels. I thought the transmission blew. Had it towed three miles to the house.

The front drive shaft splines were shot. Replaced it/DIY with BMW OEM shaft assembly for about $800.

I'm sure the splines inside the transfer case will be next. They were worn down a little, too. Currently at 122K miles and counting, so far so good.

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2003 X5 4.4i Titanium Silver