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u bolt size

Discussion in 'Differential & Driveline' started by Senditguy69, Jun 15, 2020.

  1. Senditguy69

    Senditguy69 Junior Member

    Posts:
    1
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    Joined:
    Jun 15, 2020
    Location:
    Massachusetts
    First Name:
    Zack
    Truck Year:
    1984
    Truck Model:
    K10
    Engine Size:
    350
    Hey guys new to the forum I’m building a 1984 Chevy k10 I’m swapping out the rear leaf springs with k20 leaf springs with 4 in blocks I’m wondering what width and length u bolts I need. Thanks in advance
     
  2. Jethro224

    Jethro224 Full Access Member

    Posts:
    58
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    Joined:
    May 11, 2020
    Location:
    Illinois
    First Name:
    Jim
    Truck Year:
    1980
    Truck Model:
    K20
    Engine Size:
    350
    Same width as the ones you have now +4" for the blocks + however much thicker your K20 spring packs are compared to your originals.
     
  3. bucket

    bucket Super Moderator Staff Member

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    Joined:
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    Location:
    Usually not in Ohio
    First Name:
    Andy
    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    The axle tubes are 3" or 3 1/8", I don't remember which.
     

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