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Help, bad sound from transfer case (?)

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mastiff, Aug 3, 2003.

  1. Mastiff

    Mastiff 1/2 ton status Premium Member

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    Just noticed this. When I'm in 4-Low and I go from reverse to park, it makes a terrible sound. It's like a high pitched sound of gear teeth rubbing against each other. It's just for a fraction of a second and then it stops (catches)? It sounds like this: Bzzzt. /forums/images/graemlins/grin.gif

    It doesn't do it from 4-High, only Low. And another wierd thing is that it seems to take two cycles to do it: I hold my foot on the brake and go P-R-P-R-P, then the noise. Like the first time from R to P doesn't make the noise.

    I have no idea if it's in the T-case, or maybe the front axle. I've got the stock front 10-bolt with an Auburn. Everything seems to be working right, it's just a nasty little noise! /forums/images/graemlins/frown.gif

    Thanks for any ideas!
     
  2. Confedneck

    Confedneck 3/4 ton status

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    you should really stop moving before throwing it into park...or maybe pull it out of 4lo before putting it in park..does it sound like this :
    [ QUOTE ]
    DumbassDumbassDumbass.Dumbass..Dumbass...Dumbass....Dumbass.....clunk"


    [/ QUOTE ] -Twiz
    /forums/images/graemlins/rotfl.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/rotfl.gif
     
  3. Mastiff

    Mastiff 1/2 ton status Premium Member

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    I'm not sure if you're giving me hell or if you're serious. This is sitting still the whole time, foot on the brake.
     
  4. Confedneck

    Confedneck 3/4 ton status

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    a little of both, and bringing up an old post lol..i dont see why youd put it in park with it in lo range though, i dont think you're supposed too..im not sure that the parking pawl could handle the torque multiplication
     
  5. Mastiff

    Mastiff 1/2 ton status Premium Member

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    [ QUOTE ]
    a little of both, and bringing up an old post lol..i dont see why youd put it in park with it in lo range though, i dont think you're supposed too..im not sure that the parking pawl could handle the torque multiplication

    [/ QUOTE ]

    Never heard of this before. I've always put it in park before if I'm out romping around in 4-Low and want to stop for a sec.

    I don't think I fully understand what happens when you shift into park. I always figured it was the same as neutral except that something engaged to prevent the output from turning. Is there something more to it?
     
  6. Confedneck

    Confedneck 3/4 ton status

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    now you're asking one of the non tranny expert guys lol...hopefully someone else can shed some light on the whole parking gear setup...but if its just now starting to make the noise...there's probably something wrong or starting to go wrong...
     
  7. Mastiff

    Mastiff 1/2 ton status Premium Member

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    Nobody has any idea what this might be? /forums/images/graemlins/confused.gif
     
  8. BowtieRed

    BowtieRed 1/2 ton status Author

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    i know there is a sprag, with a spring, that falls into place when in park, but when the output or internals are spinning then the sprag does not engage and buzzes under the spring's pressure when trying to fall into place.
     

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