99 STS suspension replacement or coversion?
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS suspension replacement or coversion? in Past Cadillac Vehicle Discussion; Need advice on the best suspension conversion on a 99 sts want to keep air in the back and the ...
  1. #1
    jaybee86 is offline Cadillac Owners Member
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    99 STS suspension replacement or coversion?

    Need advice on the best suspension conversion on a 99 sts want to keep air in the back and the closet ride to the electronic struts and shocks and help is great thanks in advance

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  3. #2
    Submariner409's Avatar
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    Re: 99 sts coversion?

    AC Delco struts and shocks.

    .......... or get familiar with the Monroe catalog.

    Look through www.gmpartsgiant.com, www.rockauto.com, and/or talk to Chris in Parts at Rippy Cadillac over there >>>>>>>>

  4. #3
    basscatt's Avatar
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    Re: 99 sts coversion?

    Quote Originally Posted by jaybee86 View Post
    Need advice on the best suspension conversion on a 99 sts want to keep air in the back and the closet ride to the electronic struts and shocks and help is great thanks in advance
    ---------------------------------------------
    the choice is simple - MONROE brand parts -

    if you want to keep the F45 ACTIVE suspension working as it did when new -
    ASSUMING all the other components of the ACTIVE suspension
    are still working properly -
    use the Monroe 40021 LEFT - and 40022 RIGHT electronic struts -
    and Monroe 40029 LEFT and 40030 Right rear shocks -

    40021 - $400
    40022 - $400
    40029 - $360
    40030 - $360
    TOTAL - $1520

    OR -
    convert the ACTIVE system to a PASSIVE system -
    MOST drivers WOULD NOT notice any difference -

    Monroe 71684 front struts - $62.25 each with free shipping -
    Monroe MA822 rear shocks - $58.60 with free shipping - for BOTH
    TOTAL - $183.10
    http://www.partsgeek.com/gbproducts/...FfE7MgodKz0Abw

    OH - You need 4 - 4.7K Ohm 1/2W resistors -
    RadioShack #271-1124

    AND NEVER FORGET THE "K" - RIGHT JIM?

  5. #4
    jaybee86 is offline Cadillac Owners Member
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    Re: 99 sts coversion?

    Don't care bout the f45 passive is fine just need to keep it cheap but basscat the front
    Monroe's would still need to have spring compress onto assembly or comes all together
    and if there is a kit that's easy to bolt on what's the closest one to stock. I drive like I'm 70 90%
    Of the time

  6. #5
    MoistCabbage's Avatar
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    The struts in basscatt's link are just the struts themselves.

    Quote Originally Posted by jaybee86
    I drive like I'm 70 90%
    Of the time
    You must not know sub very well yet

  7. #6
    basscatt's Avatar
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    Re: 99 sts coversion?

    Quote Originally Posted by jaybee86 View Post
    Don't care bout the f45 passive is fine just need to keep it cheap but basscat the front
    Monroe's would still need to have spring compress onto assembly or comes all together
    and if there is a kit that's easy to bolt on what's the closest one to stock. I drive like I'm 70 90%
    Of the time
    ------------------
    the front Monroe's would still need to have spring compress onto assembly
    that is correct - you could "rent" a spring compressor -
    and swap the parts yourself -

    OR take the old strut assemblies - and the new struts -
    and have a shop swap the parts for you -
    some big auto parts stores/machine shops will do this - just call around -

    unfortunately - no one makes a "quick strut" -
    one that is already assembled with all new parts -
    for your car -

  8. #7
    jaybee86 is offline Cadillac Owners Member
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    Re: 99 sts coversion?

    I'm a 2mph guy like to cruise well just until I fix this front

    I was looking at strutmasters front and rear packages they look like
    everything comes on assembly and videos look the same have heard mix reviews
    but about to have a baby in 5 months just tryn to save but still safe and I would like to keep rear air working.
    And are arrnots or suncore any good all say they have solenoids for the codes

  9. #8
    MoistCabbage's Avatar
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    There are no "solenoids" in any of the after market dampers, other than the active Monroe's. the expensive passive replacements have resistors in them to "fool" the computers. You pay 2X-3X as much for them compared to replacements without resistors. You can buy a 5 pack of resistors at RadioShack for $1.19, and install them yourself fairly easily.

    You're much better off buying the Monroe struts, and paying a shop 1/2-1 hours labor to swap them into your assemblies.

    $183.10 for parts.

    ~$15 for resistors, butt connectors, a crimp tool (assuming you don't have one), and heat shrink tubing.

    ~$40-$100 shop fees.

    ~$300 for new dampers all around. You're not going to beat that.

  10. #9
    jaybee86 is offline Cadillac Owners Member
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    Re: 99 sts coversion?

    Ok then if that's the case how would I kno if I need new springs or not and would I have to replace mounts too.

    Can I take my solenoid off the struts n leave em plugged up n ziptie away?

  11. #10
    MoistCabbage's Avatar
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    Unless the car is sagging in one corner, the springs are fine.

    Personally, I would replace the mounts. But if the rubber isn't torn, they're ok for now.

    You could remove the actuators (assuming you can get them off, and they aren't causing codes), but the resistors are a much neater, and permanent bypass.

  12. #11
    basscatt's Avatar
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    Re: 99 sts coversion?

    Quote Originally Posted by jaybee86 View Post
    I'm a 2mph guy like to cruise well just until I fix this front

    I was looking at strutmasters front and rear packages they look like
    everything comes on assembly and videos look the same have heard mix reviews
    but about to have a baby in 5 months just tryn to save but still safe and I would like to keep rear air working.
    And are arrnots or suncore any good all say they have solenoids for the codes
    ----------------------------------------------
    there are SEVERAL reasons why I recommend Monroe products -
    and the short answer is ~40 years of experience with the brand -
    and tens-of-thousands of happy customers -
    ----------------

    regarding replacing the springs - mounts - and bearing plates -

    like MC said - if the car is sagging at one corner -
    you might need new springs - but that is very rare -
    ------------------------

    if the rear end rattles going over bumps - new mounts might be needed -
    a quick visible inspection will answer that question -

    Monroe 902998 rear mounts go for around $20 each -


    -----------------------------


    the front bearing/mounting plates do take a lot of stress -
    but if you don't hear strange thumping/creaking/moaning noises -
    while going slow and turning - the bearing plates are probably OK -

    if you decide to replace the bearing plates on general principles -
    they run around $51 each - either amazon.com - or partsgeek have them -
    Monroe 902972

    -------------------

    finally - regarding the resistors/solenoids -
    the cleanest/neatest way to address this that I have seen -
    clip off the pigtails from the old "active" struts and shocks -
    solder the new resistor to the wires -
    cover with heatshrink tubing -
    and plug that back into the original harness -
    quick/easy/clean/effective/permanent - and cheap -

  13. #12
    cmpcpro is offline Cadillac Owners Member
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    Re: 99 sts coversion?

    Quote Originally Posted by basscatt View Post
    ----------------------------------------------
    there are SEVERAL reasons why I recommend Monroe products -
    and the short answer is ~40 years of experience with the brand -
    and tens-of-thousands of happy customers -
    ----------------

    regarding replacing the springs - mounts - and bearing plates -

    like MC said - if the car is sagging at one corner -
    you might need new springs - but that is very rare -
    ------------------------

    if the rear end rattles going over bumps - new mounts might be needed -
    a quick visible inspection will answer that question -

    Monroe 902998 rear mounts go for around $20 each -


    -----------------------------


    the front bearing/mounting plates do take a lot of stress -
    but if you don't hear strange thumping/creaking/moaning noises -
    while going slow and turning - the bearing plates are probably OK -

    if you decide to replace the bearing plates on general principles -
    they run around $51 each - either amazon.com - or partsgeek have them -
    Monroe 902972

    -------------------

    finally - regarding the resistors/solenoids -
    the cleanest/neatest way to address this that I have seen -
    clip off the pigtails from the old "active" struts and shocks -
    solder the new resistor to the wires -
    cover with heatshrink tubing -
    and plug that back into the original harness -
    quick/easy/clean/effective/permanent - and cheap -
    Hey Bass,

    I hear "noises"....... meaning I hear every little thing in all my vehicles, and one thing I've learned is I haven't heard suspension that doesn't make noise, I've never heard a motor that doesn't have some sort of knock to it, etc.. When I roll my windows down I "think" I can "sometimes" hear a rattle from the rear drivers side.. only when it seems to hit a certain type of bump, my guess is the mount is just starting to go.. the suspension on the other hand feels great, the car has 74k.. if it is the mount how hard would it be to just change that?

    Thanks

  14. #13
    MoistCabbage's Avatar
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    The closest thing you'll hear to a "rattle" in the suspension is from worn sway bar links. But if you can barely hear it, it's probably not suspension related.

  15. #14
    basscatt's Avatar
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    Re: 99 sts coversion?

    Quote Originally Posted by cmpcpro View Post
    Hey Bass,

    I hear "noises"....... meaning I hear every little thing in all my vehicles, and one thing I've learned is I haven't heard suspension that doesn't make noise, I've never heard a motor that doesn't have some sort of knock to it, etc.. When I roll my windows down I "think" I can "sometimes" hear a rattle from the rear drivers side.. only when it seems to hit a certain type of bump, my guess is the mount is just starting to go.. the suspension on the other hand feels great, the car has 74k.. if it is the mount how hard would it be to just change that?

    Thanks
    ------------------------------
    if it is the mount how hard would it be to just change that?
    of course everything is relative to your own skill level -
    available tools and equipment -
    but generally - it is a very easy job -

    remove the air supply hose from the shock -

    loosen - but DO NOT remove the lower mounting hardware -

    from inside the trunk - remove the two mounting nuts -

    remove the lower hardware - and drop the shock -

    on a bench - remove and replace the upper mount -

    reinstall the shock on the car -
    -----------------------

    but I agree with MC -
    the noises you are hearing from the rear
    are probably NOT from the shocks -

    sway bar links are the most common -
    than I would look for worn bushings -

  16. #15
    cmpcpro is offline Cadillac Owners Member
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    Re: 99 STS suspension replacement or coversion?

    Thanks will get under it

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