I posted a videos last year about a weird knocking noise when I go over a bump on the drivers side rear tire.

I had my mechanic look at the noise problem in the back. He said it was probably coming from the differential. Told me to check the fluid level and if that was ok, then I'll need to bring it in for further inspection.

Here's the old video

Car Sound02 - YouTube (you can really hear it around 11secs)

Another bouncing the car from the rear.

Sound when bouncing car up and down - YouTube

So the question... Is this hex set the right thing to buy for the job? I believe it's a 14mm hex that I need. http://www.amazon.com/Neiko-10074A-Metric-Pro-Grade-13-Piece/dp/B000GYLGU8/ref=sr_1_1?s=hi&ie=UTF8&qid=1333987062&sr=1-1

Thank you!

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1984 300td euro turbo