The double joint got stiffer and stiffer on mine. Felt like there was no power steering. Tried several times to lube it, smack it with a rod, etc., as others have posted, but saw no improvement until it was replaced. The double joint is crazy expensive, too - something like $400 and dealer only.

I remember replacing individual u-joints on my 240Z. Now they want us to toss the whole assembly and buy a new one...

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles