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Funny klunking when I shift gears with my SM465

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 72Blazerod, Mar 16, 2002.

  1. 72Blazerod

    72Blazerod 1/2 ton status

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    It seems that since I bought my truck about three years ago, if you don't play the clutch just right you get a violent thunk sound and fell from it. I was watching the rear drive shaft while the numb skull at the "AirCare" station shifted gears on the dyno. Holy cow, the rear drive shaft was bouncing up and down pretty bad. I have gotten pretty used to it and can shift it pretty smoothly but if anyone else drives it, it is klunk-city. Has anyone else experienced this? Is there anything I can do to get rid of the klunking?

    Let me know,

    Rod
     
  2. MudNurI

    MudNurI 1/2 ton status

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    well- just dont' let anyone else drive it, then it wont klunk


    sorry thats about as technical as an answer as I can give you LOL

    Brandy
     
  3. m j

    m j 1/2 ton status

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    new shaft?
    there will always be some 'clunk' in it
    think about all the gears and couplers that have operating clearance
    it all stacks up
     
  4. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    check the tranny transfercase mounts
     
  5. newyorkin

    newyorkin 1 ton status

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    I second mudhog, check all your mounts for decay or severe wear!

    BTW, if you have a slip yoke, try removing the driveshaft and stuffing some grease into the yoke, then reinstall and see if it's reduced. I have a lot of wear on either my output shaft or slipyoke, so every now and then I pull it, load it up with grease, and it quiets down a lot. Bad mounts will cause the yoke to slide in and out more, causing some more wear, too.
     
  6. 79Beast

    79Beast 1/2 ton status

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    Check U joints also. Your tranny may just need freshening up. You could also have slop in the rearend. How are your driveshaft angles? Are your ujoints phased properly?
     

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