Quote:
Originally Posted by andrewwynn
Hence my use of the phrase "replaced doesn't mean fixed". The symptom is of dif or.cv spline problem. (front drive shaft spins in gear).
The question is: does the front drive shaft STOP spinning when the clink/pop happens.
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Since most people will not replace the Diff with a brand new diff since it is too costly for the current crop of X5 owners, they will buy a used diff to replace it. What are the odds of buying a used diff with exactly the same problem as the original diff? Maybe he is better off playing the lottery with that type of odds.
OP had the car on a lift or jackstands and tested the powertrain. The wheels spin when place in drive and reverse. What this test doesn't do is test the powertrain components under load ie with the weight of the car on the powertrain.
Stripped front drive shaft splines are a common problem with these cars. He already stated that he can heard grinding sounds. Now he can waste more time and money chasing other solution but I would look at the common known failure problem before wasting time and money on other "Questionable Problems".