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U-Joint Problem

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 88bblazen, Oct 14, 2004.

  1. 88bblazen

    88bblazen Registered Member

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    I had my drive shaft rebuild after it was ejected from its place on my vehicle. And the u-joints they put in are loose which is makin the drive shaft vibrate. My question is i got this drive shaft from a junk yard. Is there any way i can find out what exactly u-joint goes to that drive shaft sorry for the long question help if any. <font color="blue"> </font> /forums/images/graemlins/k5.gif /forums/images/graemlins/dunno.gif
     
  2. 85mudblazin

    85mudblazin 1/2 ton status

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    What did the driveshaft come out of??
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    #1 fill out your profile

    #2 what kind of truck is this? automatic?

    #3 It sounds as if your driveshaft's yokes are shot and needing replacement.
     
  4. stallion85

    stallion85 1/2 ton status

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    I took mine to a reputable machine shop who measured the ends to find out what size u joint went in, maybe you could try that /forums/images/graemlins/thinking.gif
     
  5. 88bblazen

    88bblazen Registered Member

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    Its an 88 fullsize Automatic 4x4 350 blazer
    /forums/images/graemlins/k5.gif /forums/images/graemlins/thinking.gif
     
  6. BAJA_BLAZER

    BAJA_BLAZER 1/2 ton status Author

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    You have the wrong driveshaft and u-joint most likely. Your 88 should have a GM Corporate 10-bolt rear-end and comes with a driveshaft that uses a 3R Sagnaw style u-joint that has 1.125 inch diameter caps on it and uses the inside snap rings and is retained on the yoke with straps, not u-bolts. Earlier Blazers (Some ‘81’s, ‘80’s and older) came with GM Corporate 12-bolt rear ends, and used 1310 u-joints that have 1.0625 inch diameter caps on them and use outside snap rings. If your used shaft came from an older Blazer then the u-joint will be loose in the yoke on the rear-end.

    Fill out your profile, so we know more about you and your truck!
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Baja Blazer is absolutely right, however, a '70s driveshaft just won't bolt right into a 1988 truck, so I doubt that's the problem.
     

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