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700r4 going out?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by WakeBoard&4X4er, Aug 16, 2001.

  1. WakeBoard&4X4er

    WakeBoard&4X4er 1/2 ton status

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    Location:
    Lee's Summit, Mo
    i have a question for all you pros out there.
    Just got home from a short (30 min @ 65 ) drive and when i went to pull in to my parking area i heard a "CLUNK". Sounded like the rear end first, but when i went to back in to the parking space i heard it once again and it sounded like the tranny. when i was sitting there i went from R to D to P about 6 time and It kept doing that "Clunk." I was planning to to a Power flush on the tranny some time but is it to late? should i just pull the pan and look for "bad stuff"? or is that "normal" The truck is a 91 k5 with 4 inch lift, tranny cooler, 33s, 700r4 (91 vers know as somthing else), 3.42s, and all other stock 350.

    Thanks

    brett cox
    brettmcox@hotmail.com
     
  2. '73 K5

    '73 K5 1/2 ton status

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    Sounds like a bad Ujoint maybe??

    '73 K5
    Chevy good...Ford bad
     
  3. WakeBoard&4X4er

    WakeBoard&4X4er 1/2 ton status

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    is that hard to change klunk?
     
  4. MudbogAD

    MudbogAD 1/2 ton status

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    Could it be transmission or transfercase mounts? That would be my guess.

    Adam
    79' Jimmy
    3.08's(sucks)
    35's(Bigfoot MT's)
    Np 205, th350, 12B, 10B
    3" suspension lift
     
  5. SAVAGE1

    SAVAGE1 1/2 ton status

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    Check your Tcase crossmember bolts. Mine were loose and I was hearing the same CLUNK. If its not that then in might be a Ujoint.

    Rod
    Alameda, CA
    85 K5 6"ProComp 35"Boggers... and it's still not BIG ENOUGH!!
    <a target="_blank" href=http://coloradok5.com/gallery/K5Jungle>http://coloradok5.com/gallery/K5Jungle</a>
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    Yeah check the small stuff first... pull out the driveshaft and check the u-jt's... also check to see if the slip yoke (if equiped) is worn and check to see how much play you get in the gears in the rear end... also grab the pry bar and visually inspect the tranny mounts, etc.

    Now one thing that would be bad news is if you are driving and coming to a stop and and then reach a complete stop and a second or more passes and then THUNK! That is bad news... Of course that is only one of the various KLUNKS

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  7. Pugsley

    Pugsley 1/2 ton status

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    Ditto on the crossmember bolts - mine was doing the same thing, and I ended up limping home with it barely hanging on. Get a set of 7/16"X2" grade 8 bolts with Nylock nuts and swap them out just for good measure.

    Dos mas Tecates!!!
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  8. bigblue

    bigblue 1/2 ton status

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    I hear the same thing. When I put it in park and especially when I put it in drive. My driveshaft and ujoints are pretty much brand new. My transmission was rebuillt last september. I was thinking about going back to the tranny shop and have them look at it being that it is in warranty. It looks like my mounts are fine too. but the CLANK i doin't like....

    Surfing is Life...
     
  9. 89OKIE

    89OKIE Registered Member

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    I would like to know what captcrunch knows about the cause for the clunk after you stop. Mine does the same thing, but not all the time. It's in the tranny for sure. It's like it down shifts while your sitting there. Hope you find out.
     

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