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What was that noise?

Discussion in '40- & 55-Series Tech' started by Bodean, Aug 21, 2006.

  1. Bodean

    Bodean SILVER Star

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    The other day I was cruising down my street when I saw something and decided to back up and go down a dirt drive. I have a 78 FJ40 with a Detroit in the rear. I backed up and when I clutched and coasted while braking a big bang came from the rear. This Detroit has been in this truck for about 5 years and has been pretty quiet so far. A little ratcheting in corners but doesn't load up and bang like my lock rite used to. I was driving the truck Sunday and several times while driving straight down the road at about 45mph I felt a hesitation or like a gear didn't want to mesh right. Almost like a binding. Any ideas?

    Thanks!
     
  2. numtel

    numtel

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    Take off the diff cover and see if there are any little metal chunks in there. If there are you'll probably need a new gearset installed.
     
  3. Bodean

    Bodean SILVER Star

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    That was my next move. I really don't want to hear that though!!

    Thanks!
     
  4. Pin_Head

    Pin_Head

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    Popping and banging is normal in some situations like you describe. If it runs and doesn't make noise most of the time, no harm no foul.
     
  5. wantatlc

    wantatlc

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    yeah, I hear/feel this every once in a while with my rig in the rear with a Detroit locker. I was told in the past, and assumed, it was the locker. no other issues in normal day to day and offroad, just now and then - BANG....
     
  6. projektdotnet

    projektdotnet

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    can't hurt to check but that sounds like a detroit sound (normal) by dad said when his old chev's locked in it made the loud bang like that.
     
  7. Bodean

    Bodean SILVER Star

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    Pulled the cover off the rear and it looked great in there! I jacked it up and put it on jack stands and rotated the gears. Nothing out of place. Oh well?? I'll just take some advice that a trans. guy gave me one time "drive that thing till it quits, I've never seen anything that overbuilt"

    Thanks!
     
  8. my64fj40

    my64fj40

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    Sounds like a typical Detroit to me ;)


    Load and kinda scary, why I got one
     
  9. projektdotnet

    projektdotnet

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    Fixed if your ya :flipoff2:
     
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