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clunking from rear axle..

Discussion in 'Chevy Trucks' started by ronnunan, Jan 7, 2007.

  1. ronnunan

    ronnunan Junior Member
    Messages: 6

    I have a 79 K10 with locking rear diff..and hear a clunking when turning right and left at slow speeds especially when making a sharp right or left from stand still. I went to an axle place who specialize in these problems and they told me I needed the additive...I put the two tiny bottles in the axle...they smelled like rotten eggs...The clunking got better but still remains there. Any ideas..I dont fully trust their opinion. Altough I was ready to spend 1,000 to rebiuld and they said I didn't need it.
  2. RYDER

    RYDER Senior Member
    Messages: 281

    I would get a 2nd. opinion.
  3. Mark Witcher

    Mark Witcher Senior Member
    Messages: 604

    The clutch type diff wont make a clunking noise. You probably need a rebuild. Those 10 bolt axles are prone to break down.
  4. derekbroerse

    derekbroerse 2000 Club Member
    Messages: 2,377

    Better confirm, is this a clutch-type positraction unit or a Gov-Lock? I'm assuming this isn't something aftermarket like a Powertrax locker, I hate mine, it makes soooo much noise... but thats another story.

    Do you still have proper lockup between the L & R sides if, for example, you brake-torque it up a little?

    Is the noise bad? Is it suddenly a new noise?