1972 Plymouth Duster 340 Ride Height

Discussion in 'Suspension, Steering and Chassis' started by jpikaart, Jun 27, 2014.

  1. jpikaart

    jpikaart Member

    Messages:
    24
    Likes Received:
    0
    Joined:
    Nov 10, 2013
    Location:
    Bloomfield Hills, MI
    Local Time:
    9:25 AM
    I have a 1972 Plymouth Duster 340 and the rear end seems to sit high. The previous owner installed MOPAR Super Stock Springs 2800 pound Summit 4120683/4 springs on the car.

    Does anyone know the baseline ride height measurements and where to take these measurements so that I can compare my car to the factory baseline numbers?
     
  2. burrpenick

    burrpenick '72 Duster

    Messages:
    310
    Likes Received:
    15
    Joined:
    Jan 16, 2008
    Location:
    Florida
    Local Time:
    8:25 AM
    no one answered the height issue? I'm in need too!
     
  3. KnuckleDuster

    KnuckleDuster Well-Known Member

    Messages:
    1,494
    Likes Received:
    529
    Joined:
    Nov 9, 2005
    Location:
    Texas
    Local Time:
    9:25 AM
    Found this on FB the other day and saved it.
    Sorry, posted it quickly, after looking at the measurements, it doesn't answer your ride height question. I was thinking it showed frame height from the ground.

    FB_IMG_1533391331895.jpg
     
    Last edited: Aug 5, 2018
  4. 72bluNblu

    72bluNblu FABO Gold Member FABO Gold Member

    Messages:
    8,635
    Likes Received:
    2589
    Joined:
    Nov 28, 2008
    Location:
    NorCal
    Local Time:
    6:25 AM
    Wow, there’s an old thread revival!

    There really isn’t a factory ride height spec for the rear. The front suspension height was set using LCA measurements that are independent of tire height and ground clearance, so the ride height actually changed depending on the tire options. The specs for A-bodies are listed under the "V&L" lines in this image from the FSM

    factoryalignspecs-jpg-jpg.jpg

    In the back the factory height was basically with a near zero arch spring though. The car should sit pretty much level front-to-rear with the factory specs. The SS springs are usually a good 1.5" lift from stock, although the amount of rake also depends on if you're running taller tires out back too.
     
  5. Bodyperson

    Bodyperson Well-Known Member

    Messages:
    522
    Likes Received:
    211
    Joined:
    Nov 26, 2015
    Location:
    NW Montana
    Local Time:
    7:25 AM
    If you don't like the look of the height you can have the springs re-arched.
     
  6. 72bluNblu

    72bluNblu FABO Gold Member FABO Gold Member

    Messages:
    8,635
    Likes Received:
    2589
    Joined:
    Nov 28, 2008
    Location:
    NorCal
    Local Time:
    6:25 AM
    You could, but that would defeat a lot of the purpose of having the SS springs. You'd just end up with really stiff springs that don't launch as well as they did before.
     
  7. Bodyperson

    Bodyperson Well-Known Member

    Messages:
    522
    Likes Received:
    211
    Joined:
    Nov 26, 2015
    Location:
    NW Montana
    Local Time:
    7:25 AM
    I understand. Just trying to reinforce the idea that there isn't really a specification and it's all just what tires and look you want.
     
  8. 72bluNblu

    72bluNblu FABO Gold Member FABO Gold Member

    Messages:
    8,635
    Likes Received:
    2589
    Joined:
    Nov 28, 2008
    Location:
    NorCal
    Local Time:
    6:25 AM
    Oh totally. The only spec for the suspension height I'm aware of was for the front, and as I've said before even that spec pretty much goes out the window when you start running radials instead of bias ply's.

    The SS springs are really designed for drag racing though, so, if drag racing isn't the primary use of the car I would look at different springs before I looked at having the SS springs re-arched. There are much better spring options for a street car, especially if you don't want the ride height the SS springs give you.
     
    • Like Like x 1
    • 67autocross

      67autocross A new iron curtain drawn across the 49th parallel

      Messages:
      858
      Likes Received:
      303
      Joined:
      Jul 23, 2010
      Location:
      Winnipeg
      Local Time:
      8:25 AM
      With super stock springs you end up with a huge difference in ride height on the front suspension if you want the car to sit close to level .... if you can get rid of those springs and a get a matching set I would if it was me.