HP60 Scratch Build Help?

Discussion in 'Axles / Suspension / Tires' started by mark dupont, Apr 13, 2019.

  1. mark dupont

    mark dupont Active Member

    Joined:
    Dec 26, 2009
    Location:
    Mooresville, NC
    Budget building a HPD60 front axle assembly for my 1983 CJ8, will be traditional pass drop & SUA... I have an empty HP60 pumpkin, tubes have been removed so I have a clean sheet to work with. Tube is 3.125 x.50 DOM, tube will be sourced through Stock Car Steel.

    Have NOT yet purchased kingpin nor inner "C" parts yet.

    I've scoured Pirate, BillaVista and various manufacturers websites for info.

    Since the spring inboard/outboard configuration and overall WMS-WMS length is currently undetermined, the question is who has or where can I find info on "assembled" knuckle dimension to determine how much tube I need to purchase so I can do a rough dimensional sketch. Since I have the pumpkin on the bench, the pressed in depth is easy enough to acquire, just need knuckle dimension.

    Thanks,

    Mark
     
  2. adamk

    adamk Well-Known Member

    Joined:
    Nov 20, 2010
    Location:
    Burlington
    Let me dig back through stuff in the shop. At one point @Chris_Keziah and I did all the math using 99-04 super duty Cs, knuckles and unit bearings.

    Edit: from the inner C to the mounting surface on the unit bearing is ~11.25”
     
  3. mark dupont

    mark dupont Active Member

    Joined:
    Dec 26, 2009
    Location:
    Mooresville, NC
    Greatly appreciated Adam! I would expect dimensions for Kingpin would be different, Kingpin being wider???

    I now wish I went a little wider overall however as the project sits - Tarheel built my REAR D60 semi-float at 59.75" wms-wms. My thought is build the front axle ass'y at aprox. 60.50"/75" wms-wms.

    Considering the outboard kit to add a little more front-end stability, make sense????
     
  4. Chris_Keziah

    Chris_Keziah Joe Dirt

    Joined:
    Dec 1, 2010
    Location:
    Winston-Salem
    I wouldn't bother with king pin stuff, I'd run 99-04 or 05+ Ford 60 outers. You're in a pickle if your rear is only ~60" wide, for a trail rig I'd shoot for 65-67" wide on a shorter wheel base.
     
    XJsavage and iwaxmyjimmy like this.
  5. iwaxmyjimmy

    iwaxmyjimmy College Web Wheeler

    Joined:
    Mar 10, 2007
    Location:
    Greenville NC
    Personally I’d look into using 78/79 Ford d60 inner shafts and 05-up outters. Custom shafts suck to get in a pinch unless you can throw stupid money at it. But I can agree you’re gonna want more width. Especially with leafs up front because you’ll get into the leaf spring when turning.
     
  6. XJsavage

    XJsavage Warlock of Zante plantation

    Joined:
    Aug 15, 2009
    Location:
    Swamps of Congaree river basin
    The super duty 60 knuckles and Cs being as large as they are, might push the overall width out more than what you're wanting. The kingpin set up is definitely more compact.

    If you decide to go the 99 to 04 route, I can pull any measurements you need off of my front.
     
  7. adamk

    adamk Well-Known Member

    Joined:
    Nov 20, 2010
    Location:
    Burlington
    @Chris_Keziah has a set of 99-04 SD60 inner Cs and knuckles I’m sure he’d let go
     
  8. mark dupont

    mark dupont Active Member

    Joined:
    Dec 26, 2009
    Location:
    Mooresville, NC
    Appreciate the feedback very much.... I’ve been wheelin’ the Scrambler for about 16 years, when I first built it I put in a GM 4.3/700R4 and WT44 rear and narrowed a Waggy 44 front, Detroit’s both ends and 37’s... the combo worked well with a decent turning radius... for this build I increased the axle width by 5” to accommodate outboard towers and longer shocks for the rear. I also figured outboarding the front springs would give me an extra 2” to move the pumpkin over enough to angle the front shaft and gain additional 700r4 pan clearance.

    All feedback very much welcomed!!!!

    Power provided by GM 5.3L 450hp plant & Holley Terminator TBI kit.
     
    iwaxmyjimmy likes this.
  9. drkelly

    drkelly Samurai wheeler

    Joined:
    Mar 21, 2005
    Location:
    Oak Ridge/Stokesdale, NC
    Building a front axle like that seems like a lot of unnecessary work to me. I would be very tempted to switch to driver drop and just use a SD60 and matching rear axle. The pair can be bought for as little as $400-500. Isn't it easier to pass a driveshaft down the other (driver) side of a 700R4? Plus I believe the SD60 pumpkins are further offset to the outside than the popular 78-79 Ford HP60's so driveshaft clearance should be better. Obviously the TC would have to be changed. Don't let the parts you have on hand like that rear D60 and front housing dictate the direction of your build. They can be sold. Just my 2 cents.
     
  10. mark dupont

    mark dupont Active Member

    Joined:
    Dec 26, 2009
    Location:
    Mooresville, NC
    Thanks for putting the fly in the ointment... considered that route 80-bazillion times... May have to reconsider again.
     
  11. shawn

    shawn running dog lackey of the oppressor class Administrator

    Joined:
    Mar 13, 2005
    Location:
    Raleigh, NC
    Thanks for being the asshole on this one. I was going to be the guy that said "buy a 05+ SD front, they're only $300", but decided to keep my mouth shut. :flipoff2:
     
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  12. NickMaul

    NickMaul Well-Known Member

    Joined:
    Jul 4, 2009
    Location:
    Virginia Beach
    You should get one. They are only like $300. Even if you don’t want to use it you try to lift it up and realize a Dana 44 is just as heavy :D


    Sent from my iPhone using Tapatalk
     
  13. Jody Treadway

    Jody Treadway Croc wearing fool Moderator

    Joined:
    Mar 20, 2005
    Location:
    Hendersonville, NC
    If you are keeping it leaf sprung, 99-04 SD housing or at least from the knuckles out.
    Use 88-96 Ford short side shaft and a 77-79 Ford pass side inner on other side. That'll be about the shortest OEM length combo.
    Otherwise you'll need a custom long side inner.
     
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  14. drkelly

    drkelly Samurai wheeler

    Joined:
    Mar 21, 2005
    Location:
    Oak Ridge/Stokesdale, NC
    Don't miss this point that was mentioned. Placing the leaf springs WIDE apart on an axle with a 60"WMS could cause you to end up with a 100 foot turning radius.
     
    NickMaul likes this.
  15. mark dupont

    mark dupont Active Member

    Joined:
    Dec 26, 2009
    Location:
    Mooresville, NC
    Seriously, thank you to those who’ve offered their opinions, very much appreciated. Looks like I’ll be reconfiguring my thought process...
     
    Chris_Keziah likes this.

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