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Proper way to seat rear springs?

This is a discussion on Proper way to seat rear springs? within the General Help forums, part of the LSx Technical Help Section category; I've been reading and searching for 2 days and nothing helpful appeared. So I replaced my rear end in my ...

  1. #1
    She-Member jrbonds's Avatar
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    Proper way to seat rear springs?

    I've been reading and searching for 2 days and nothing helpful appeared.

    So I replaced my rear end in my car last week, put new shocks on, new swap bar bushings, installed my LCA's and panhard bar. But when I'm shifting the back end "shifts" to the left.

    A couple of people told me I need to "seat" my rear springs, but did not elaborate on how I am suppose to do this. Unless someone has other suggestions on why my back end is swaying after shifting into each gear. And no, it previously didn't do this.

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    Is the rear sway bar attached properly?

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    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by jrbonds View Post
    I've been reading and searching for 2 days and nothing helpful appeared.

    So I replaced my rear end in my car last week, put new shocks on, new sway bar bushings, installed my LCA's and panhard bar. But when I'm shifting the back end "shifts" to the left.

    A couple of people told me I need to "seat" my rear springs, but did not elaborate on how I am suppose to do this. Unless someone has other suggestions on why my back end is swaying after shifting into each gear. And no, it previously didn't do this.
    Did you load the suspension a few times after putting everything back on? I am guessing you torqued everything down while the suspension was loaded correct?
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    She-Member jrbonds's Avatar
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    Sway bar is right.....

    But what do you mean by load? Guess I didn't do this.

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    Senior Member theorangeguy's Avatar
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    Quote Originally Posted by jrbonds View Post
    Sway bar is right.....

    But what do you mean by load? Guess I didn't do this.
    Pretty sure he's asking if you had jack stands under the rear end to simulate the tires sitting on the ground with the full weight of the car pushing down on everything you installed.
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    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by jrbonds View Post
    Sway bar is right.....

    But what do you mean by load? Guess I didn't do this.
    Jack the rear up until the springs are tight or until you just start lifting the car up by the rear or put the rear tires on ramps. Then re-torque everything to ensure it is still to spec. What you are doing is essentially mimicking the load it could be put under while driving tightening everything down with the suspension unsprung or not under load can result in everything not being as tight as it should with a variety of other problems.

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    Spaz is My Mentor SMWS6TA's Avatar
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    ^^^
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    She-Member jrbonds's Avatar
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    Quote Originally Posted by theorangeguy View Post
    Pretty sure he's asking if you had jack stands under the rear end to simulate the tires sitting on the ground with the full weight of the car pushing down on everything you installed.

    Ah gotcha. Yes I did this. But i'm also a girl and had hardly any freaking help. So maybe my muscle strength on tightening stuff wasn't that great. I'll try this again tonight.

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    Moderator 98TransAmWs-6's Avatar
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    Using a torque wrench so you know it is tightened to spec would be the best plan if you have one.

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    She-Member jrbonds's Avatar
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    Quote Originally Posted by 98TransAmWs-6 View Post
    Using a torque wrench so you know it is tightened to spec would be the best plan if you have one.

    No my ex took it when I kicked him out. I'll see if I can borrow one.

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    Pretty sure most of the suspension stuff gets torqued to around 75 lb.ft.

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    Veteran 0rion's Avatar
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    let me ask you this just because I'm curious......how do you know the rear is shifting to the left if you're driving and shifting it? That rear has mulitple contact points that should keep it from moving around like that. LCA's, panhard, and sway bar. Do you have the stock or adjustable panhard?

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    Pan hard bar is the primary link to stabilizing the shifting of the rear end laterally. LCA's control front to back, and the torque arm controls rotational movement. I would also ensure your PHB is tight and that a bolt hole has not elongated causing slop. Could just be that this happened coincidentally at the same time as installing other suspension components.
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    It's on jackstands.

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    She-Member jrbonds's Avatar
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    Quote Originally Posted by 0rion View Post
    let me ask you this just because I'm curious......how do you know the rear is shifting to the left if you're driving and shifting it? That rear has mulitple contact points that should keep it from moving around like that. LCA's, panhard, and sway bar. Do you have the stock or adjustable panhard?
    Just feels loose back there, left/right movement when I shift. No even hard shifts. And it's a stock panhard bar, I ordered an adjustable one that should be in this Saturday I hope.

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    Veteran 0rion's Avatar
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    that panhard mounts from the back of the rear up to the frame so it really shouldn't be moving around like that unless something is loose or elongated like Jon said. Just tighten the shit out of everything when you put the new panhard in there.

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    She-Member jrbonds's Avatar
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    Quote Originally Posted by 0rion View Post
    that panhard mounts from the back of the rear up to the frame so it really shouldn't be moving around like that unless something is loose or elongated like Jon said. Just tighten the shit out of everything when you put the new panhard in there.
    Yes I know. And I will. I am going to get under there tonight and take a look at stuff.

  17. #17
    She-Member jrbonds's Avatar
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    Sway bar nut was loose on the drivers side.
    LCA bolt on drivers side body was almost gone. Only hanging on because it got wedged between the body and LCA.
    LCA bolt on drivers side on the rear end was loose.
    Panhard bar on passenger side was entirely loose.
    Springs were tilted. Rotated to a certain position that I read on ls1 how to.

    Went for a test drive and holy cow, NO more issues.

    Oppppps.

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    Moderator 35th-ANV-SS's Avatar
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    Lucky your car didn't fall apart on you lol.
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    Proper way to seat rear springs?

    Stop doing stuff tired and late at night Jodi. :
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    She-Member jrbonds's Avatar
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    I know. But it was to a point were I was worried and knew I had to crawl under there.

    All good now. I'm torquing all that crap down Saturday while it's on the lift.

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