What transfer case gear ratio to run?

Discussion in 'Axles / Suspension / Tires' started by biggun68, Jan 6, 2019.

  1. biggun68

    biggun68 Active Member

    Joined:
    Oct 27, 2010
    Location:
    Mooresville
    rockwell axles 6.72. Th400 Trans 2.48 low. 43" tires. Looking into SCS drop box and wondering what gear ratio to start with. Rock bouncer.
     
  2. paradisePWoffrd

    paradisePWoffrd Recovering Project Junkie

    Joined:
    Nov 5, 2005
    Location:
    Newton, NC
    how much HP? I would like say something in the 3.0 range with a healthy motor or in the 4-5 range with something smaller.
     
  3. XJsavage

    XJsavage Warlock of Zante plantation

    Joined:
    Aug 15, 2009
    Location:
    Swamps of Congaree river basin
    As high as 2:1 if you have 400+ hp
     
  4. Stuntman Autoworks

    Stuntman Autoworks Well-Known Member

    Joined:
    May 6, 2010
    Location:
    Sanford NC 27330
    Good thing about the SCS is it would be pretty easy and relatively cheap to swap ratios if you ended up needing something different. With the 6.72 in the rockwells i'd say something in the 2.X range.
     
  5. Mac5005

    Mac5005 Welding Instructor

    Joined:
    Oct 19, 2005
    Location:
    Rocky Mount
    Probably 2.3-2.5 range to get a decent crawl ratio and really get wheel speed up in 2nd gear.
     
  6. StretchASU

    StretchASU Got a real good set of match tires on there...

    Joined:
    Oct 17, 2006
    Location:
    Durm
    Since all LS cam and a tune rock bouncers make 600+ to the wheel, a 2-3xcase should be plenty.
     
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  7. biggun68

    biggun68 Active Member

    Joined:
    Oct 27, 2010
    Location:
    Mooresville
    E23B1170-B3A7-4944-8DA2-F83111CA310D.jpeg 1200-1400hp. I was leaning towards 2.0
     
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  8. jeepinmatt

    jeepinmatt Still Fat

    Joined:
    Mar 24, 2005
    Location:
    Stanley, NC
    You could have just started a thread that said "Hai u guis I have over 1200hp!" instead of pretending to ask for T-case ratio advice :p
     
  9. biggun68

    biggun68 Active Member

    Joined:
    Oct 27, 2010
    Location:
    Mooresville
    I was tring to figure what would be best to have some low gear and have enough high gear wheel speed.
     
  10. drkelly

    drkelly Samurai wheeler

    Joined:
    Mar 21, 2005
    Location:
    Oak Ridge/Stokesdale, NC
    Atlas 4spd with 2:1, 2.72:1, and 5.44:1.
     
  11. a_kelley

    a_kelley mister mechanical fixer

    Joined:
    Jan 26, 2010
    Location:
    Rutherfordton
    Fify
     
  12. biggun68

    biggun68 Active Member

    Joined:
    Oct 27, 2010
    Location:
    Mooresville
    I've seen some of the atlas not hold the power?
     
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  13. Van-go

    Van-go Not an old man

    Joined:
    Dec 11, 2014
    Location:
    Greensboro
    Yeah, the 4 speeds may end up breaking the intermediate shaft.
    I like the titan box from NWF with a ford or Chevy 205.
    One of the strongest set ups out there and you have 1:1 2:1 2.72:1 and 5.33:1

    With that much power, and Rockwells, you really only need 1:1 for hill killing. And
    a built 205 may be fine for crawling.
     
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  14. Mac5005

    Mac5005 Welding Instructor

    Joined:
    Oct 19, 2005
    Location:
    Rocky Mount
    Thinking of that much power, I’d run scs for sure and stay around 2:1.

    Hope you are getting a custom converter built just for this?

    If not call PTC, give them all your details including gearing, tire size, cam specs, weight etc. they will build a converter for your application. Install and be happy.

    Best thing we have done behind the 502.... it’s light years better than off the shelf rated “stall” converters.
     
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  15. XJsavage

    XJsavage Warlock of Zante plantation

    Joined:
    Aug 15, 2009
    Location:
    Swamps of Congaree river basin
    I drool over the black boxes. Definitely get a Ford 205 over a Chevy. Considering a 205F already has 32 spline outputs f/r, fixed yokes and can be had for $200 or less, it beats a 205C any day.
     
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