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conversion ujoint problem

Discussion in 'The Garage' started by chulisohombre, Feb 16, 2004.

  1. chulisohombre

    chulisohombre 1/2 ton status

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    i used a conversion joint in my rear shaft and it is loose.a 3/4 ton full float 14 bolt uses a 1350 joint isnt it?the joint i used was a neapco #3-3140.is this the correct joint.when i looked in the book it came up with that number.it is a 1310 1350 conversion.the caps fit the right way but the trunion is about 1/8 of an inch too short on the 1350 side so the end caps can slide side to side and never seat on the center of the trunion.
     
  2. Blazer1970

    Blazer1970 1/2 ton status

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    I think I have seen Jesse from High Angle post that it is very common for those yokes to spread. Otherwise you have a 1410 yoke - the only difference is the width of the joint - caps are the same diameter as a 1350.
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    That is the correct joint. If it's loose in the yoke you either have a problem with the hardware or the yokes need to be replaced.
     
  4. chulisohombre

    chulisohombre 1/2 ton status

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    did they ever put 1410 yolks on 3/4 ton rears?if so i think that is what i have.it is just a 1/16 of an inch wider than the 1350 joint i had in there.do they make a 1310/1410 conversion joint?or do i have to change the driveshaft yoke?
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    They do not make any conversion joint to go to or from 1410 as far as I know.

    No stock truck from our era ever had 1410 joints.
     
  6. chulisohombre

    chulisohombre 1/2 ton status

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    so somebody had to put in that yolk on my 14 bolt then?i will have to take a measurement and see what the width is to make sure what size joint it is.also will have to modify my driveshaft to take the 1410 yolk on that side.
     
  7. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]
    i used was a neapco #3-3140.

    [/ QUOTE ]I used a neapco 2-1153 with my 3/414BFF 1350 and stock 85' shaft. I see your truck is a first gen so my guess is that is why 2-1153 number didn't come up. /forums/images/graemlins/dunno.gif
     
  8. funkycold

    funkycold 1/2 ton status

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  9. chulisohombre

    chulisohombre 1/2 ton status

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    i guess my yolk on my 14 bolt is junk.there was not that much space in between the sides of the yolk.back to the junkyard for anether one.either that or the joint i got was off a little on size.thanx for the visual.
     
  10. chulisohombre

    chulisohombre 1/2 ton status

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    rjfguitar i think that 10 bolts use a 1330 joint in the shaft instead of the 1310 in my 72 with 12 bolt.
     
  11. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    rjfguitar i think that 10 bolts use a 1330 joint in the shaft instead of the 1310 in my 72 with 12 bolt.

    [/ QUOTE ]

    10 bolts use a Saginaw S44 joint.

    [ QUOTE ]
    [ QUOTE ]
    i used was a neapco #3-3140.

    [/ QUOTE ]I used a neapco 2-1153 with my 3/414BFF 1350 and stock 85' shaft. I see your truck is a first gen so my guess is that is why 2-1153 number didn't come up. /forums/images/graemlins/dunno.gif

    [/ QUOTE ]

    That is a Saginaw S44 to 1350 joint. He says he has Spicer 1310.

    A Saginaw S44 is a bigger joint than a 1310, significantly.
     

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