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why is the rear U joint differnet????

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by sanssocs2, Sep 5, 2001.

  1. sanssocs2

    sanssocs2 Registered Member

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    Location:
    Mobile, Alabama
    i am in the middle of replacing both the univ. joints in the rear driveshaft. i got the one next to the transfer case in no problem but i am having problems with the one that connects to the rear pinion. the u joint is shaped like a cross. usually all the caps on the u joint are all the same size.. but connected to the pinion where the cv joint is the u joint just does not fit.. does anyone know the reason for this.. i have a 85,305V8, stock 10 bolts, NP208, what is the reason for hte differnt cup size and what do i need to get so that it will fit..please help

    <P ID="edit"><FONT class="small">Edited by sanssocs2 on 09/05/01 09:40 PM.</FONT></P>
     
  2. Pugsley

    Pugsley 1/2 ton status

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    You must have some kind of hybrid joint - are you running 14 bolt or another upgraded axle? If so, you've got 2 different cup sizes to deal with.

    1 tequila 2 tequila 3 tequila Floor
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  3. coopertwpk

    coopertwpk 1/2 ton status

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    Do you have a 12 bolt rear?if so it may have the two size joint at napa its a 447#

    88k5 silverado w4"lift <font color=orange>d44 and corp14ff</font color=orange> with 4.56s
     
  4. NYC K5

    NYC K5 1/2 ton status

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    i had the same problem. i did my rear in march and when i went to the parts store the first time they gave me the small universal for my rear and it didnt fit. when i went to get the right one i went to a different store and the catalog they had said to use the same one that i had, so i made them check another book and then they came up with the right one. by the way i also have an 85 with a 305 and a 4 speed.
     

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