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Thread: noisy monroe conversion shocks

  1. #1
    timman is offline Cadillac Owners Fanatic
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    noisy monroe conversion shocks

    Hi everyone , anyone expierence noise / squeeking / clunking from the Monroe 90007 conversion kit for the rear of a 2001 caddy Seville ??? I am on my second pair with them and having no luck. replaced all related rear end parts , but still noisy. (mounts were also replaced 2 times). If anyone has any suggestions I would really appreciate it. I am thinking of switching over to Monroe MA822 with AK29 air kit. (air compressor and level switch were shot when I bought the car. any help ?????? suggestions ????? Thanks , Tim


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  3. #2
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: noisy monroe conversion shocks

    Quote Originally Posted by timman View Post
    Hi everyone , anyone expierence noise / squeeking / clunking from the Monroe 90007 conversion kit for the rear of a 2001 caddy Seville ??? I am on my second pair with them and having no luck. replaced all related rear end parts , but still noisy. (mounts were also replaced 2 times). If anyone has any suggestions I would really appreciate it. I am thinking of switching over to Monroe MA822 with AK29 air kit. (air compressor and level switch were shot when I bought the car. any help ?????? suggestions ????? Thanks , Tim
    --------------------------------
    if you had asked before getting the coil-over conversion kit -
    I would have STRONGLY suggested the MA822's with the manual fill AK29 kit -

    another advantage of the MA822 -
    they are 100% compatible with the factory hoses -
    so if you decide to hit the "MAN-MALL"
    and find a good uned height sensor - and used compressor -
    you can be back to the "original" ELC system -

    by the way - the same compressors are used on a LOT of GM cars -
    98 to 04 Seville -
    00 to 05 Deville -
    97 to 04 Buick Electra and Park Ave -
    00 to 05 Buick LaSabre -
    95 to 99 Buick Riviera -
    95 to 03 Olds Aurora -
    00 to 04 Pontiac Bonneville -

  4. #3
    Yaemish is offline Cadillac Owners Connoisseur
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    Re: noisy monroe conversion shocks

    I have the MA822s and I did have the ACDelco (Gabriel) replacements. I would go with the MA822s as the GM ones require a dryer spring replacement to get them to work correctly.

  5. #4
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Dryer spring?

  6. #5
    Yaemish is offline Cadillac Owners Connoisseur
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    Re: noisy monroe conversion shocks

    As I understand it, the air pressure that is exerted by the air compressor is a certain PSI. That PSI is regulated by the dryer and part of that assembly has a spring inside. In order for the Gabriel Hijackers (Which GM also sells) to receive their correct air pressure (the air bag is larger), a softer spring is needed to get the PSI up for 18 to 22.

    This necessity isn't something that GM mentions when they sell you the re-branded Delco hijackers. Instead they are sold as plug and play. However, some other forum member discovered that the Delco replacements were the Gabriel's and with that discovery they found that Gabriel had specific instructions to change this spring as well. If you go with the Monroe's, you won't have to change the spring (though I do suspect that additional air would help those as well as proven by the feel of a softer ride with a load in the trunk).

    The the Delco replacements you would sometimes get a clunk in the back end because the top of the shaft would hit something (because there wasn't enough air). That clunk would go away with people in the back seat. In short, go with the MA822s.

  7. #6
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    A larger bladder would take more volume of air to raise the same weight, not more pressure. The compressor puts out A LOT more than 18 PSI, and the dryer is on the INTAKE side of the pump. The whole spring thing makes absolutely no sense.

  8. #7
    Yaemish is offline Cadillac Owners Connoisseur
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    Re: noisy monroe conversion shocks

    I'm pretty sure the spring makes the compressor close a valve or something at 18lbs, I could be wrong trying to explain how it works. The information about the spring having something to do with the volume of is accurate though. To avoid confusion it is worth mentioning that I am speaking about the AC Delco 504-123 parts specifically. That spcific part is a re-branded Gabriel HiJacker 49228. If you were to order the Gabriel 49228, it would come with the spring that I am talking about.

    I read in the Deville forums where people talked about the "under inflated" problem and I experienced it myself. You would go over some bumps and hear a thump in the back end of the car. If you were to add some weight to the trunk or a person in the back, the ride height would be a touch higher and have more air. The noise would stop until the rear end lowered. When I switched to the MA822s, the problem stopped.

    edit: The spring I am talking about is clearly displayed in the product picture on Amazon http://www.amazon.com/Gabriel-49228-.../dp/B000DINHMW

  9. #8
    Tankboy40's Avatar
    Tankboy40 is offline Cadillac Owners Fanatic
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    Re: noisy monroe conversion shocks

    Quote Originally Posted by timman View Post
    Hi everyone , anyone expierence noise / squeeking / clunking from the Monroe 90007 conversion kit for the rear of a 2001 caddy Seville ??? I am on my second pair with them and having no luck. replaced all related rear end parts , but still noisy. Thanks , Tim
    Have you considered the possibility that it might not be the shocks? I hear there are rubber bushings back there that sometimes fail...

  10. #9
    ELDO GUY's Avatar
    ELDO GUY is offline Cadillac Owners Fanatic
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    Re: noisy monroe conversion shocks

    A long time ago I replaced the shocks on my 82 eldo with the gabriels , and I remember that they came with a replacement spring also . Didnt know why it had to be changed but I did it any way shocks worked perfectly. So the spring thing is not new .

  11. #10
    timman is offline Cadillac Owners Fanatic
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    Re: noisy monroe conversion shocks

    anyway.......I replaced them with the MA822 and AK29 manual fill kit. Ride is quiet and smoothe. Advance auto refunded the price of the 90007 shocks !! Thanks , Tim


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