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Rear End Fast

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Innerpiece, Jun 22, 2001.

  1. Innerpiece

    Innerpiece 1/2 ton status

    Feb 22, 2001
    Likes Received:
    Mississippi (Yee Haw)
    Hi all --

    After driving through some "puddles" my rear end has developed a problem that hopefully you folks can help me fix...

    The truck: 87 Silverado K5 Blazer, 150K, 305, th700, np208, corp 10 bolt with govlok, 32x10.5x15 nobbies

    The Problem: The rear diff is pinging. It sounds like someone dropping BB's into a metal frying pan. It happens more when there is "slack" in the driveline (low power regardless of speed) and when turning. I'm not loosing any power at the diff. I changed the diff oil 3 or 4 months ago, but didn't put posi-trac stuff in b/c I didn't know anything yet. No money now to buy new rear axle.

    The questions: Is this my gov-lok shitting the bed, have I sucked a bunch of water in and compromised the gear oil, or is this the gov-loc talking b/c there's no posi-trac goo in there?

    When I pull the cover, what should I look for (other than big chunks of metal)? If the gears are in good shape, is it possible to just wrench the gov-lok out and have more-or-less an open diff? When I put the cover back on, what can I use as a gasket (silly-cone?)? What else should I know?

  2. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

    Feb 7, 2001
    Likes Received:
    Richmond, VA
    Yeah, check for chunks. Also check for water in the oil. I will come out milky in color. 10 bolt Gov-lock's have not been known for strength and reliability.
    Yes you can use RTV, it works fine.

    '83 GMC Jimmy 4x4 ZZ4 Crate Motor
    '83 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
    '94 Impala SS
    '01 Chevy 2500HD w/8.1L & Allison Auto
  3. HarryH3

    HarryH3 1 ton status Author

    May 31, 2000
    Likes Received:
    Georgetown, TX
    The Gov-Loc isn't doing any "work" while you're driving in a straight line. You need to stop driving that truck until you can open the rear end and check for damage. If something is seriously wrong in there then the rear end can lock without warning. Makes for a real wild ride...

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
    It's a great day to be alive...
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

    May 30, 2001
    Likes Received:
    IL, USA
    Yeah take it from me. My 35x12.50s stopped me from 40 mph in about 50 feet when my 12 bolt locked up.

    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
  5. CaptCrunch

    CaptCrunch 1/2 ton status

    Feb 2, 2001
    Likes Received:
    Yup pull the cover and see what is going on before it really blows up or leaves you stranded. I'm betting that you have lost a part in the gov loc. You may bea able to just remove the part that busted out and refill...Gov-Lok probably doesn't/won't work but oh well... time for a locker [​IMG]. A high quality silcon RTV works good. My personal preferance is to go to a Chrysler/Dodge dealer and get their ATF-RTV.... awsome suff!!!

    1987 Chevy K5 Blazer- 350 TBI
    <A target="_blank" HREF=http://www.geocities.com/milnerlives_2000/blazer.htm>http://www.geocities.com/milnerlives_2000/blazer.htm</A>

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