Linked FJ45 Coilovers with FJ80 Control Arms

Discussion in 'HardCore Corner' started by Tank5, Sep 28, 2018.

  1. Tank5

    Tank5 SILVER Star

    Messages:
    1,315
    Likes Received:
    330
    Joined:
    Nov 16, 2009
    I am not in a position to start this anytime soon but researching and thinking through it is part of the fun, so I am planning way ahead of the action.

    I am considering my options for installing a linked suspension on my 65 SWB fj45. The 45 has already had the leaf spring suspension modified prior to my buying it and I don't like it. It is flexy but dips like crazy when I hit the brakes and on the highway it is not a nice as i want it to be. Currently it is setup with a 5" SUA lift using Alcan custom springs and a shackle reversal in the front. I am running 37" tires and want to keep that size tire and lift height.

    I am really interested in keeping the road handling manners at highway speed as good as possible. I intend to use the 45 for overlanding type travel and want to drive it to the trail head or cross country where ever I am going. I want to keep it trail capable to run some of the passes in the Silverton and Ouray area, mildly technical trails in Moab, and the Rubicon.

    When the conversion is done I will swap the current axles for a fj62 stock front axle and a narrowed FF 80 rear axle to 58 WMS, so I am trying to maintain a 60 series axle width under the 45.

    I have been considering adding a complete 80 series suspension under the 45 but using coilovers instead of the sock spring and shock configuration.. I already have all of these components except the coilovers to build this I am just not sure if this is the right way for me to go.

    I am also considering Proffitt's Cruiser's 3 link front and 5 link rear set up. I sent them an email to get a quote and their thoughts. I expect it will be pricier but I like their work.

    I have searched the foum and the web and found 45 on 80 chassis builds, linked 40 builds, and even a 40 with all 80 series suspension components welded in but not a mix of 80 series arms with coilovers on a 40 series frame. I expect someone has done this or has though it out and I am curious to know the pros and cons. If I missed it and there is a build like this please post the link.

    Because everyone likes pictures this is what I am stating with.

    VC.jpg
     
    69LC and GW Nugget like this.
  2. pbr streetgang

    pbr streetgang Supporting Vendor SILVER Star

    Messages:
    1,428
    Likes Received:
    469
    Joined:
    Nov 3, 2006
    Location:
    AZ
    How about starting with an 80 series rolling chassis and swapping the 45 body onto it?

    fj40 body fj80 frame

    Too cool.

    If I didn't love my 80 as is it would likely end up under this 45...
    PCH.jpg
     
    Last edited: Sep 28, 2018
    Tank5 likes this.
  3. Tank5

    Tank5 SILVER Star

    Messages:
    1,315
    Likes Received:
    330
    Joined:
    Nov 16, 2009
    I just sold my 45/80 project. I went that direction first but had to thin the heard. My house is only big enough for one cruiser like this.
     
    Last edited: Sep 28, 2018
    2fpower and pbr streetgang like this.
  4. GW Nugget

    GW Nugget There's nothing funnier thn dyslexic perfectionist

    Messages:
    2,772
    Media:
    7
    Albums:
    1
    Likes Received:
    2,452
    Joined:
    Jul 25, 2014
    Location:
    Coalinga, CA
    I would do flipped 80 arms on top of the front axle. Just saw this 1st hand on a 60 series on Diamond axle by Valley Hybrids in Stockton, CA get with Goerg there.... @ orangefj45
    Screenshot_20180928-191658.png Screenshot_20180928-191622.png
     
  5. 74fj40

    74fj40

    Messages:
    2,719
    Likes Received:
    510
    Joined:
    Mar 12, 2005
    Location:
    Littleton, Colorado
    Do you have any more pictures of that thing? Looks cool
     
  6. Tank5

    Tank5 SILVER Star

    Messages:
    1,315
    Likes Received:
    330
    Joined:
    Nov 16, 2009
    That does look like a good idea. I will have to talk to George about that.

    I see they went with rollovers too.
     
  7. Tank5

    Tank5 SILVER Star

    Messages:
    1,315
    Likes Received:
    330
    Joined:
    Nov 16, 2009
    I wonder if castor correction parts work the same with the arms like that?
     
  8. gpfj40

    gpfj40

    Messages:
    243
    Albums:
    1
    Likes Received:
    185
    Joined:
    Nov 2, 2013
    Location:
    Grande Prairie AB
    It’s possible to put 80 series radius arms under a 40 with coil overs. I did it with coils and shocks on an 80 series front axle. It rides way smoother, but it dives when you brake hard too so you won’t cut that out. I don’t have a front sway bar and I wish I did for on road driving at speed. Coil overs would make packaging a sway bar easier attached to the frame. You might find the 60 series width is tight for coil overs but I think it’s do able. The 80 series radius arms are good in the rubber bushings keep things quiet as compared to hiems. Use Johnny joints for the panhard to keep it quiet, I made this change after the first heims started banging on my panhard bar and they are great. What you propose will be smoother, but I’m not sure it would be worth the work or cash having done it already, given you have a functioning rig, I might just buy some nice shocks and rock the leaves if it was me. Just my 2 cents, take it for what what it’s worth. If you do it post it up so I can follow along.
     
  9. Tank5

    Tank5 SILVER Star

    Messages:
    1,315
    Likes Received:
    330
    Joined:
    Nov 16, 2009
    thanks for the comments. Do you have any pictures of your build. Curious to see how tight is is.

    Eventually I would like to link the front and rear trying as best I can to recreate the way my fj80 rides. You suggest ed just running the leads which is what I have to do for a while anyhow but I could upgrade the shocks and see what difference it makes.

    I wonder if I added a coilovers with the leaves if it would improve the road manners without making it supper stiff. i will research this some and see what I find. Has anyone tried thisthis? It would be a good interim fix until I could do the link set up.
     
  10. gpfj40

    gpfj40

    Messages:
    243
    Albums:
    1
    Likes Received:
    185
    Joined:
    Nov 2, 2013
    Location:
    Grande Prairie AB
    There is a build thead in this section a few pages back. I think there is a link in my signature but I can’t seam to see it on my phone so here it is: '74 FJ40 Build: My 1st Cruiser

    The fj80 suspension graft is somewhere in the middle.

    If you give up 2” on either side of the axle width your coil overs might need to be vertical and there could be interference with the frame on the droop side when you twist it up, assume you are talking about 14-16”. I set these up with 9” shocks cause I felt that was the limit of the radius arms and I had the shocks already.

    This camera angle makes it look like there is more room than there actually is. There is just the diameter of the coil plus 1/2” there.

    image.jpg image.jpg
     
  11. Mace

    Mace rock scientist.. Staff Member s-Moderator

    Messages:
    21,623
    Likes Received:
    2,067
    Joined:
    Feb 17, 2002
    Location:
    Las Vegas
    What is the offset of those rims?
     
  12. Tank5

    Tank5 SILVER Star

    Messages:
    1,315
    Likes Received:
    330
    Joined:
    Nov 16, 2009
    I read through your build, I like your 40. I saw you used the full 80 width axle with your front conversion. I understand why you say a 60 width would be tight.
     
    gpfj40 likes this.
  13. White Stripe

    White Stripe

    Messages:
    6,358
    Likes Received:
    4,460
    Joined:
    Jan 6, 2012
    Removing the shackle reversal would reduce brake dive considerably if the shackles are put back up front. Getting caster dialed in also will really increase road manners. I have a similar setup as yours, I personally don't mind the brake dive.
     
    74fj40 likes this.
  14. Rock40

    Rock40

    Messages:
    1,429
    Media:
    7
    Albums:
    3
    Likes Received:
    1,078
    Joined:
    Feb 21, 2012
    Location:
    Snohomish, WA
    5 link radius arm front and standard 4 link rear, that's what I'm running and it works great. The huge challenge with a 40/45 series LC is that there is VERY limited room for any front suspension links. And yeah, this is my happy face.....

    IMG_2281.JPG

    IMG_2279.JPG
     
  15. Tank5

    Tank5 SILVER Star

    Messages:
    1,315
    Likes Received:
    330
    Joined:
    Nov 16, 2009
    That is a nice looking 40. How does it handle on the highway? I really want to maintain good highway manners.

    I traded emails with Proffitts Cruiser's as I am interested in their 3 and 5 link set up but also considering an 80 suspension because I have it all already. They suggested going with the 80 suspension for what I am trying to achieve. I am leaning towards the complete 80 series suspension a the moment.
     
  16. Rock40

    Rock40

    Messages:
    1,429
    Media:
    7
    Albums:
    3
    Likes Received:
    1,078
    Joined:
    Feb 21, 2012
    Location:
    Snohomish, WA
    It’ll do 80mph no problem. I run a rear sway bar and it’s pretty damn stable, much more so than when it was sprung over. I’ve done probably 10k in highway miles (some towing an M416 trailer) with no issues. RTI is over 1200 with 12” coilovers
     
  17. Mieser

    Mieser

    Messages:
    694
    Likes Received:
    1,057
    Joined:
    Mar 23, 2004
    [​IMG]

    I built a FJ45-esk body on top of a FZJ80/LX450 chassis. I just got back from doing a 2400 miles shakedown run with the Rubicon Trail in the middle. The 80 series chassis a very good starting point, my best advice is to keep it as stock as possible!
     
    Ronny Grady, GLTHFJ60 and Tank5 like this.
  18. 69LC

    69LC

    Messages:
    2,295
    Likes Received:
    1,865
    Joined:
    Jan 12, 2008
    Location:
    Allendale, MI near GVSU
    @Mieser how do those tires perform? I’d like to find a set of 37” that are skinny looking and could handle road/snow use, save the chubby swampers for the mostly off pavement.
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.