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Thread: 89-90 crossmember vs 91+

  1. #1
    Supporting Member Turbo Mopar Contributor
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    89-90 crossmember vs 91+

    I have an 89-90 stamped arm crossmember, can I use the 91+ cast arms on this crossmember?
    Thanks!
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  2. #2
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: 89-90 crossmember vs 91+

    They should bolt right in. I've made the swap from later arms to earlier arms with no problem. I believe the only issue would be with the later, larger Dynasty and 5th Avenue. Those cars with the heavier axles had a different K frame and arms from what I've read.

  3. #3
    turbo addict
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    Re: 89-90 crossmember vs 91+

    Dynasty has the same k frame (minus the bobble strut bracket). Arms and knuckles are different.

  4. #4
    Supporting Member Turbo Mopar Contributor
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    Re: 89-90 crossmember vs 91+

    Thanks Gentlemen.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  5. #5
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: 89-90 crossmember vs 91+

    Quote Originally Posted by thedon809 View Post
    Dynasty has the same k frame (minus the bobble strut bracket). Arms and knuckles are different.
    What's the difference with the arms and knuckles?

    Are they wider? Different caster etc?

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  6. #6
    turbo addict
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    Re: 89-90 crossmember vs 91+

    I looked it up and they showed different part number IIRC. The k frame was the same part number as all the other automatic k car k frames. I'm putting a dynasty dual pivot k frame in my lancer.

  7. #7
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: 89-90 crossmember vs 91+

    Quote Originally Posted by thedon809 View Post
    Dynasty has the same k frame (minus the bobble strut bracket). Arms and knuckles are different.
    That's interesting. I definitely recall someone posting pictures years ago of the Dynasty arms no fitting a K frame. perhaps the guy's K frame was just messed up, but that does strike me as odd.

  8. #8
    turbo addict
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    Re: 89-90 crossmember vs 91+

    This is an 89 or 90 dynasty k frame with arms from a lebaron or p body. Can't remember. Has energy suspension bushings. Working on drilling + tapping my stock 87 SL sway bar for end links.

  9. #9
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: 89-90 crossmember vs 91+

    According to the ever reliable Wikipedia, there was a wheelbase change in 91. That's probably when they used the different arms.

    https://en.wikipedia.org/wiki/Dodge_Dynasty

  10. #10
    Hybrid booster
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    Re: 89-90 crossmember vs 91+

    In the knowledge center there is a write up on the crossmember and control arms. There seems to be a small difference. Check it out

  11. #11
    Supporting Member Turbo Mopar Contributor
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    Re: 89-90 crossmember vs 91+

    Quote Originally Posted by spiro440 View Post
    In the knowledge center there is a write up on the crossmember and control arms. There seems to be a small difference. Check it out
    Thanks, I have forgotten about that article.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

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