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Rear Spring Install

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TXsizeK5, Feb 11, 2002.

  1. TXsizeK5

    TXsizeK5 1/2 ton status

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    What are some pointers when going from blocks to springs? How tight should i torque the U-bolts... anything i can do the "break in" the springs? Thanks.

    87 Custom Deluxe
    305/Sm465/ NP208
    4.56 , 6"susp, 35" BFG Muds, CatCo Cat & Series 40 delta flow 3" tips.
     
  2. txbartman

    txbartman 1/2 ton status

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    On my 10-bolt with new springs, I torqued my u-bolts to 120-150 ft lbs. Then, drove it around the block a few times and did it again. AMazing how much they will loosen up with a little driving. Each day after work for about a week I re-torqued them, just to be safe.

    Nothing special to break them in. They just do it by themselves over time.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  3. TXsizeK5

    TXsizeK5 1/2 ton status

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    Alright and is there anyhting that will change? As in the angle the axle sits at, driveline angles or any of that crap? Or should it just be like it is now... Thanks

    87 Custom Deluxe
    305/Sm465/ NP208
    4.56 , 6"susp, 35" BFG Muds, CatCo Cat & Series 40 delta flow 3" tips.
     
  4. txbartman

    txbartman 1/2 ton status

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    As far as height difference, that really depends. For example, if you had 4" lift blocks with factory springs that had sag, and then installed fresh 4" springs in place of them, you will sit higher. The new springs would match the block height but also counter any previsouly existing spring sag. And, what I have discovered, is a 4" spring may vary from manufacturer to manufacturer as to the actual height.

    In relation to angle, I assume your blocks probably already shim the axle up a little. I have never had, used, or even seen blocks up close, but I believe they have shims on/in them. Your springs will also need to be shimmed. If they are actual 4" (for example) springs, they might already have shims on them. Mine did. If not, you may have to get some to equal the amount of shim your blocks had. Contact your local 4x4 shop about some shims or maybe someone else on here will respond that knows more about shimming. Mine came with them on the springs, so I didn't have to worry.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  5. BlueKnight

    BlueKnight 1/2 ton status

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    hehe I just worked on my rear srpings and have the blood and bruises to prove it. Ok ubolts. need to be torqued to 140 ft lbs according to super lift. Use an air hammer with a point to get stubborn bolts from not coming out. Oh yeah and make sure your U bolts are not any longer when tightened snug that your deep socket. cross tighten the U bolts and check them again after you put the vehicle on the ground.

    <font color=purple>79' K-5 396cid 600hp, TH350, NP203</font color=purple>
    <a target="_blank" href=http://blueknight.alloffroad.com>http://blueknight.alloffroad.com</a>
     

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