gearing question. not 4.88's

Discussion in 'General Discussion' started by SRT2SLOW, May 13, 2014.

Car Parts
  1. SRT2SLOW

    SRT2SLOW Active Member Supporting Member

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    Question. so with higher hp trucks. would we benifit from 4'10's?
     
  2. stealth78

    stealth78 Full Access Member

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    Your title is going to upset Caveman
     
  3. stealth78

    stealth78 Full Access Member

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    In all seriousness I've been wondering the exact same thing!
     
  4. stealth78

    stealth78 Full Access Member

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    Have you really dialed in any real good runs through the 1/4 with that much HP? If so what is your trap mph?
     
  5. SRT2SLOW

    SRT2SLOW Active Member Supporting Member

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    why?

    no not yet. I dont wana break anything before I move.
     
  6. stealth78

    stealth78 Full Access Member

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    Because 488's are his specialty!
     
  7. caveman

    caveman Well-Known Member Supporting Member

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    We totally overthink this gearing thing. The rule of thumb should be to match the tire size to the gear ratio, so that you are running through the traps at the top of 4th. Bigger HP trucks can run a bigger tire, and thus use a taller gear. The reason short gears don't work on the track is that they require a shift to 5th gear prior to crossing the line.
     
  8. moparviper

    moparviper Full Access Member

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    I might be able to help you out in a couple weeks. I plan to be around 825 - 850 whp. Suppose to be going to the dyno this week and the track this week or next. Currently the truck has 4.56 so I'll let you know how it goes. Depending on where I run out of gear I will be going back to the 4.10s or 3.73s
     
  9. caveman

    caveman Well-Known Member Supporting Member

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    You are running a TH400, correct? What tire are you planning on using? How much RPM do you want to run?
     
  10. MOD(S)QUAD

    MOD(S)QUAD Full Access Member

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    Can the '04 rear with the 4.10 be swapped out with the '05-6 with 4.56's or is their more to it ?
     
  11. caveman

    caveman Well-Known Member Supporting Member

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    Hang on, I've seen this asked before. Let me see if I can dig up that thread for you. :D
     
  12. MOD(S)QUAD

    MOD(S)QUAD Full Access Member

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    Ut oh....will this make me look stupid ??
     
  13. caveman

    caveman Well-Known Member Supporting Member

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    LOL! No. It's an inside joke. Often, the first thing a new guy will come on here and ask is questions regarding gear swaps. When that happens, I sometimes bump a dozen or so old threads, to encourage them to use the search function. In your case, I think asking a gear swap related question in an active thread about gear swaps makes sense.

    Oh, and to answer your question directly, yes. You can install shorter gears in your factory 4.10 housing. The consensus is to call Devin at Unitrax (http://gounitrax.com), and he will get you everything you need.
     
    Last edited: May 13, 2014
  14. moparviper

    moparviper Full Access Member

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    M&H 32 X12 slick and I'll be shifting at 5800 RPM when the nitrous turns off. I'll run it out to 6000 without nitrous
     
  15. caveman

    caveman Well-Known Member Supporting Member

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    Are you running an overdrive of any sort?
     
  16. caveman

    caveman Well-Known Member Supporting Member

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    You shouldn't need a taller gear. 5800RPM, with 4.10's, and a 16" tire radius, will get you 134mph through the traps. That's fast enough to run low 10's.
     
  17. moparviper

    moparviper Full Access Member

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    Talk to Devon at unitrax. He sells a complete kit. But you do need a different pinion bearing
     
  18. VPRPWRD

    VPRPWRD VTCoA Ring Leader Supporting Member

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    Caveman is known for bumping old threads of the same question asked over and over, don't mind him...


    See, he even admits to it :D
     
  19. moparviper

    moparviper Full Access Member

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    No over drive. The unknown factor is what don't know what gearing is in the TH400
     
  20. MOD(S)QUAD

    MOD(S)QUAD Full Access Member

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    Let me rephrase my question ; it seems at times the grass is greener and the 4.10 guys want 4.56's and peeps making more power wanna go the other way....sooo if was just an easy swap, could someone potentially just find another member with the different ratio and it would be easy peasy to switch em ??

    The whole rear that is ....
     
    Last edited: May 13, 2014