2004 DHS Limiting Rear Suspension Travel
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Suspension, Brakes and Tires Discussion, 2004 DHS Limiting Rear Suspension Travel in Item Specific Cadillac Discussion; I have a 2004 DHS that I have changed the rear doors to suicide doors, and have designed a control ...
  1. #1
    RGlennA's Avatar
    RGlennA is offline Cadillac Owners Member
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    I have a 2004 DHS that I have changed the rear doors to suicide doors, and have designed a control module for opening and closing via remote or manually from the inside, (in case you are wondering this is being done to make it wheelchair accessible).

    Anyway, the issue at hand is that the suicide hinge housing protrudes into the wheel well so I am looking at options for limiting the travel of the rear suspension without overly changing the smooth ride. The main issue is not as much higher speeds as it is something like pulling into a driveway. This is a low speed move that shifts the cars weight onto one back wheel.

    Things that I have considered are as follows:

    1 Adding adjustable spring spacers
    2 Increasing the length of the control arm on the level sensor to trick the car into riding slightly higher
    3 Adding some type of bump stop so that the suspension behaves as designed but up to a predetermined travel
    4 Switching out the rear springs for a stiffer spring, (limo spring, sport suspension spring, etc.)
    5 Some combination of the first 4

    So...thoughts??

    The following was just posted on the DeVille forum but I thought that there may be some suspension guys out there that don't visit that forum so I am adding it here.

    I have a 2004 DHS that I have changed the rear doors to suicide doors, and have designed a control module for opening and closing via remote or manually from the inside, (in case you are wondering this is being done to make it wheelchair accessible).

    Anyway, the issue at hand is that the suicide hinge housing protrudes into the wheel well so I am looking at options for limiting the travel of the rear suspension without overly changing the smooth ride. The main issue is not as much higher speeds as it is something like pulling into a driveway. This is a low speed move that shifts the cars weight onto one back wheel.

    Things that I have considered are as follows:

    1 Adding adjustable spring spacers
    2 Increasing the length of the control arm on the level sensor to trick the car into riding slightly higher
    3 Adding some type of bump stop so that the suspension behaves as designed but up to a predetermined travel
    4 Switching out the rear springs for a stiffer spring, (limo spring, sport suspension spring, etc.)
    5 Some combination of the first 4

    So...thoughts??

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2004 DHS Limiting Rear Suspension Travel

    Treading in foreign territory, but ........... bump stop.

  4. #3
    RGlennA's Avatar
    RGlennA is offline Cadillac Owners Member
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    Re: 2004 DHS Limiting Rear Suspension Travel

    First...I got your msg about merging the threads, thx.

    Regarding bump stops, I have just started looking into them, lot's of options if I had a Jeep.

    It also occurred to me that if I can find a website that sells the huge rims that they might have some solutions. I'd never put 22's on a DHS but anyone that does that for a living has probably run into this same issue and may have some combination of things that work to limit wheel travel.

    Anyway, thanks for the reply.

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2004 DHS Limiting Rear Suspension Travel

    Someone will chime in - if you don't get something substantive in this forum we'll move the whole thread up to Deville.

    Yes, the far-out modification people - donks and baggers - may have some suspension modification info. BUT they are few and far between in these forums.

  6. #5
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: 2004 DHS Limiting Rear Suspension Travel

    I have thought about this for a little while -

    but I have more questions than answers -

    I need pics of the problem -
    that would be MOST helpful -

    show me the potential problem -

    what might rub where - and how -

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

    without DRAMATICALLY changing things -
    there are only a couple things that come to mind -

    on the ride height sensor - there is a slight amount of adjustment -
    you might gain an inch of body height -

    if you needed more height than that -
    you could alter the ride height rod -
    and pick up a couple inches -

    the stock ACDelco rear shocks have less "travel" than the Monroe MA822 -

    you could install the MA822 shocks - along with the AK29 manual fill kit -
    and inflate the shocks to as much as 120 PSI -

    the rear end would sit up 4 inches - maybe more -

    of course when you make this much of a change -
    it adversely affects other things -

    front alignment -

    handling will SUCK -
    because you have shifted a LOT of weight from the back to the front -

    no more night driving -
    you will NEVER be able to aim the headlights higher than 15 feet in front of the car -

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

    you COULD use stiffer springs -
    but that is going to destroy the ride of a DHS -

    stock DTS are quite a bit stiffer -
    and only available through a GM dealer -
    the part numbers are -
    front - 22197592 -
    rear 25670966 -

    limo and commercial chassis stuff - FE7 - are usually a LOT different -
    and just won't work on a regular Deville -

  7. #6
    RGlennA's Avatar
    RGlennA is offline Cadillac Owners Member
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    Re: 2004 DHS Limiting Rear Suspension Travel

    @basscatt - Thanks for the info. I'll try getting some pics.

    Do you have a feel for how much variation might be in the level sensor mounting bracket? I am looking for some small adjustments that do not fundamentally alter the ride, one of which would be to trick the level sensor into thinking the rear was sitting lower so it adds a half inch or so of clearance. I could remove the sensors and extend the arm that goes from the suspension to the encoder, (I have a lathe/mill combo in my garage), or possible adjust the mounting bracket so it sits lower which would also work.

    The other thing would be to try swapping out the rear springs, but I do like the DHS ride...smooooooth. Anyway, I can probably find a pair at a junk yard. Living in SW Florida means that there is never a shortage of wrecked Cadillacs to get parts from. Thanks again for the DTS rear spring part number.

  8. #7
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: 2004 DHS Limiting Rear Suspension Travel

    Do you have a feel for how much variation
    might be in the level sensor mounting bracket?

    my guess would be none -

    I am looking for some small adjustments
    that do not fundamentally alter the ride,
    one of which would be to trick the level sensor into thinking
    the rear was sitting lower so it adds a half inch or so of clearance.

    a 1 inch change should be fairly simple -

    I could remove the sensors and extend the arm
    that goes from the suspension to the encoder,

    it's easier than that -

    the connecting rod uses a ball and socket connection -

    there is a plastic socket on each end of the rod (link) -
    and a ball on the sensor and another on the control arm -

    carefully remove the two plastic sockets off the rod -
    ya - that's the hard part -
    and "make" a new link that is a little longer than the original -

    I did this on a Seville - using threaded rod from Home Depot -

    if you have a scrap yard close -
    it would be worth getting a couple extras -
    the plastic sockets are pressed - or melted onto the rod -
    and are not supposed to come apart - EVER -

    every full-size FWD GM has the Electronic Level Control -
    so they should all have the link - Cadillac - Olds - Pontiac - Buick -

    new - these links are $35 from the dealer -

    ------------------------
    The other thing would be to try swapping out the rear springs,
    used 2000 to 2005 DTS springs might be hard to find -
    new ones are not that expensive -

    keep in mind - the DTS springs will not change ride height -
    they are just stiffer -

    but I do like the DHS ride...smooooooth
    I hear that!

  9. #8
    RGlennA's Avatar
    RGlennA is offline Cadillac Owners Member
    Automobile(s): 2004 DeVille DHS
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    Re: 2004 DHS Limiting Rear Suspension Travel

    Thanks for the info on the making a new link. I think that I am now leaning towards extending that arm and putting in bump stops to limit the travel. This way I gain an extra 1/4" to 3/8" height, (shouldn't be real noticeable), and then the suspension will work as designed and only at the extent of wheel travel will the "as designed" suspension be altered.

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