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  1. #1
    Member jwawhite's Avatar
    Join Date
    Jun 2004
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    oxnard
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    120
    Corvette(s)
    2003 Anny Coupe

    Default Differential Seals

    The seals are leaking once more. The tell tale sign, other than the spots in the driveway, is a burning smell while at a traffic light.
    The oil leaks on the exhaust pipes.

    Question, the car has about 40 k on it now and the first time they went out was under warranty, so about 2006 at the latest.

    What could be the cause? Could a bur be on the shaft? Is there "play" on the shafts wearing out the seals quickly? Something out of alignment?

    Have an extended warranty about to expire Feb), and I can't renew it, so I'll get it fixed next week.

    Any ideas about why they are failing?

    Isn't that new Vette something? Just read the Mar Motor Trend article!

  2. #2
    Technical Writer for Internet & Print Media
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    Jan 2001
    Location
    Southern California
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    6,507
    Corvette(s)
    71 95 04 12

    Default

    Quote Originally Posted by jwawhite View Post
    The seals are leaking once more. The tell tale sign, other than the spots in the driveway, is a burning smell while at a traffic light.
    The oil leaks on the exhaust pipes.

    Question, the car has about 40 k on it now and the first time they went out was under warranty, so about 2006 at the latest.

    What could be the cause? Could a bur be on the shaft? Is there "play" on the shafts wearing out the seals quickly? Something out of alignment?

    Have an extended warranty about to expire Feb), and I can't renew it, so I'll get it fixed next week.

    Any ideas about why they are failing?

    Isn't that new Vette something? Just read the Mar Motor Trend article!

    Usually what leaks is not the axle shaft seals but the seals between the axle housing and the side covers. Sometimes if the first repair fails, it was because it wqas not done properly, per the most recent service bulletin.

  3. #3
    Technical Advisor c4c5specialist's Avatar
    Join Date
    May 2001
    Location
    New Haven, Ct. USA
    Posts
    3,742
    Corvette(s)
    Nope, but someday.

    Default

    Hi there,

    The key to all of the rear differential repairs is accurate service procedures, just as stated by Hib.

    However, the leak position is always the key. Is it from the area between the transmission and the differential housing, the bottom of the side cover seam or is it coming from the axle seal for the halfshaft itself???

    All of these different leak points may require different service procedures.

    So, note your leakage point and that could help us further. However, normal side COVER TO DIFF CASE usually doesnt soak the exhaust and produce a smell unless its been happening for years.

    Allthebest, Paul
    GM World Class Certified Technician.
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  4. #4
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    Member chuck's Avatar
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    Feb 2001
    Location
    Tallmadge,Ohio
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    213
    Corvette(s)
    1977 Dark Red Coupe/Buckskin 04 Spiral Gray/Gray

    Default

    My 04 has that leak repaired twice both times at the dealer. Be sure to check that your transaxle breather is not plugged. The plugged breather will build up pressure and cause the oil leak. I believe GM offers a improved breather tube.
    2004 Spiral Gray/Gray - 1977-Dark Red,Buckskin

  5. #5
    Member Junkman2008's Avatar
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    Aug 2007
    Location
    Kentucky
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    509
    Corvette(s)
    2001 Navy Blue Metallic Coupe

    Default

    I repaired my differential leak (it was the common left side output shaft seal), at 60,000 miles. As of 140,000, it has not leaked again. One thing that I did per the service manual that I never hear talked about in these differential leak threads is I did NOT go WOT for the first 300 miles. I think that may have something to do with guys having to have this repair done more than once in a close time frame. You can tell that my leak was the output shaft seal by just looking at the leak. If it was the case seal, it would not have leaked it a upward direction toward the output shaft seal. It never landed on the exhaust however and caused a stink. Are you positive that's where the oil is hitting the exhaust? That would take a pretty good leak, I'm thinking.

    Last edited by Junkman2008; 02-03-13 at 09:35 PM.
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