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measuring lift, rear blocks?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dasanii19, Apr 5, 2007.

  1. dasanii19

    dasanii19 1/2 ton status

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    The block is slanted, so im thinking I measure from the long side to see how much of a lift I have, correct? Im measring 3 1/2" does this look and sound right to you?


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  2. sweetk30

    sweetk30 professional hooker Premium Member

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    block for 4" lift. the rear blocks come in under sized to the frt springs. dont forget taper short to front of truck long to back of truck.
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Measure the block in the center, this is how much lift you will gain. The taper to the block is just going to rotate your pinion angle up (or down) depending on which way you install the block. The large part is what is supposed to go toward the back of the truck so it will point your pinion upward to help with pinion angle.
     
  4. thebird00

    thebird00 1/2 ton status

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    I have this same question in the garage right now. It seems obvious to put the tall side to the back and the short to the front, but I always thought with a non cv driveshaft you want you driveshaft angle to match at the transcase and the diff. Installing it that way puts the u-joint at zero angle at the rear diff which I always thought caused vibrations and u-joint failure.

    Sorry not trying to steal the tread. But yeah measure from the center of the block for the amount of lift.
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    You're forgetting that when you lift the rig your driveline angle is changing and the taper block is there to help it. On short wheelbase vehicles it is very hard to get the working angles the same and keep the driveline angle correct at the same time. Either one being off can cause a vibe.
     
  6. thebird00

    thebird00 1/2 ton status

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    Forgot to mention its on a 93 long bed dodge. With it in there as stated the driveshaft is at zero angle with the diff. with it flipped the diff is parallel with the transcase. superlift said to put it in like you stated. just wondering.
     
  7. imiceman44

    imiceman44 1 ton status

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    If the long side is 3.5" the block is a 3" block, like I guessed from the pics that you showed me a while back.
    The middle is where you wanna measure and it will be 3" :D
     
  8. dasanii19

    dasanii19 1/2 ton status

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    haha yea I remember you telling me that awhile ago, your good!! I was meaning to ask you to keep an eye out for me if you would for some 3/4 ton axles. Id like to do the upgrade.

    Thanks
     
  9. imiceman44

    imiceman44 1 ton status

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    Did you see my post?
    I am selling a set.
     
  10. dasanii19

    dasanii19 1/2 ton status

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    I saw it after I replied. Didnt you sell one axle?
     
  11. imiceman44

    imiceman44 1 ton status

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    I have front 8 lug outers. :D
    I'll PM you and we'll talk.
     

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