Bad differential bearings on a '99 355 ? | FerrariChat

Bad differential bearings on a '99 355 ?

Discussion in 'Technical Q&A' started by kevfla, Feb 19, 2004.

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  1. kevfla

    kevfla Formula 3

    Nov 20, 2003
    Full Name:
    gone 4 good
    A friend's 355 is in the shop for 10K service and diagnosis of a speed-sensitive "whap-whap-whap" sound from the rear of the car that he originally thought was maybe a bad tire. After new tires were installed (needed them anyway), the sound persisted. The shop replaced a wheel bearing that, upon removal, was determined to be bad, replaced, yet the noise persists. Now the belief is the differential bearing could be bad. The "book" time for R & R is 60 hours. Yes, 60 hours! Not to mention, the bearing is probably around a grand. Any thoughts, similar experiences? For relatively low mileage, the bearings should last a little longer than that, shouldn't they? Especially with the sealed bottoms of a 355. Car has approx 12,000 miles, 6-speed. Thanks in advance.
  2. Aeroengineman

    Aeroengineman Formula Junior

    Oct 5, 2003
    Maple Valley, WA
    Full Name:
    Dave Tegeler
    My tensioner bearings on my cam belt were failed on my 355 when I had the 30K done a month ago and the car has only 13K on it. the problem comes if the car sits for a long period of time like mine did before I bought it.

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