Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

3/4 ton Axle Swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by RobbieOH, Feb 15, 2002.

  1. RobbieOH

    RobbieOH Registered Member

    Joined:
    Feb 15, 2002
    Posts:
    79
    Likes Received:
    0
    Location:
    Shoreline Washington 98133
    I Have a 75 K5 with a bad rearend, and my friend said he had a set of 3/4 ton axles that I could put in there. My question is: are the yokes the same and will they bolt directly in place of my 1/2 ton axles? Also, I what other modifications will be necessary to put these axles in my Blazer?
     
  2. outlaw612

    outlaw612 1/2 ton status

    Joined:
    Feb 11, 2001
    Posts:
    2,342
    Likes Received:
    0
    Location:
    Springfield, Illinois
    The front yoke is the same but the rear is different. You can get a conversion u-joint from NAPA(#447) for about $30. It will fit your stock driveshaft to the new rear yoke. They are a direct bolt in, but you will need thingfs such as:
    u-bolts
    8 lug wheels
    the rear u-joint
    I think thats all, atleast all I can think of off hand.

    <a target="_blank" href=http://www.geocities.com/outlaw613/K5.html>http://www.geocities.com/outlaw613/K5.html</a>
     
  3. Mudstud

    Mudstud 1/2 ton status

    Joined:
    May 29, 2001
    Posts:
    1,472
    Likes Received:
    1
    Location:
    Memphis, TN
    There are actually two different ujoints for this conversion. Most seem to use the one mentioned above but there is another, of course, I can't think of it right now. If you have a 75 then as long as the 3/4 tons are from an 84 or 87 (I have heard both) and older truck they should slide under there fairly easily but with the hassles outlined above. NOTE- The e-brake can become an issue but I think the brakelines should hook up fine.

    Mudstud
    <a target="_blank" href=http://communities.msn.com/OffroadK5s/6superliftand33s.msnw>http://communities.msn.com/OffroadK5s/6superliftand33s.msnw</a>
    76K5 6" with 33s, sb400/350/203parttime/3.73-D44/GM12bolt
     
  4. POWERMAD

    POWERMAD 1/2 ton status

    Joined:
    Mar 4, 2001
    Posts:
    3,466
    Likes Received:
    0
    Location:
    Oregon
    The joint is a #348 for that year. The E-brake will bolt right up.
    A set of 8 lug 15x10 's cost me 191 delivered.


    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  5. 87superblaze

    87superblaze 1/2 ton status

    Joined:
    Mar 12, 2001
    Posts:
    104
    Likes Received:
    0
    Location:
    Upper Michigan
    There are a few issues when converting. I had a few problems because my 3/4 ton axles were from an older truck.

    --Keep the front brake lines from the 3/4 ton axles. They will cost $90 to replace and you 1/2 ton line won't work.
    --The axle tube may be smaller on the 3/4 ton (D44) so new U-bolts will be an issue along with the pads. Also if you have a dual steering stabilizer set up, those U-bolts will be different.
    --8 lug wheels instead of 6 lug and the grinding of the brake calipers if you want to stay with 15" wheels and tires.
    --The emergency brake line on the rear
    --Rear U-joint

    Thats about all I can think of right now. I am currently going throught the swap this weekend and last weekend. I am sure the benefit will by far out weight the time to do it.

    Make sure the axles are in good condition!! Then you won't have a hard time like I am having.
    Good Luck!!

    My Truck <a target="_blank" href=http://www.community.webshots.com/user/nicksm79>http://www.community.webshots.com/user/nicksm79</a>
     

Share This Page