Speed in Gears

Discussion in 'Performance Mods' started by Silverback, May 18, 2006.

  1. BIG NANA

    BIG NANA Full Access Member

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    Well, I know that my last run at the Maxton Mile was 155MPH in 5th with my 4.56 rear gear, and I was very close to redline, so I am hoping that your figures are correct, cause I'm going to order the 4.88 gear Monday morning and see what happens after Christmas on the test track. Cause in April, I'm going for that 167MPH National Record. Thanks for the info.
     
  2. JMB Justin

    JMB Justin Active Member Preferred Vendor

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    Do not go with 4.88's, use a 4.11 gear and you will see approx. 170MPH at 5500RPM assuming stock transmission ratios and stock height tire (approx. 31.5). You will never pull 6th gear to 170MPH in a reasonably stock powered truck with 4.88's (only 4400 RPM).
    Justin
     
  3. 1qksrt

    1qksrt Full Access Member

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    I,m sure I see aprox. 80 MPH at the top of second,will have to double check when I can! I,ve hit 160 plus:D (not stock,4.56s) in 5th and sixth,I believe That I can hit 175:dontknow: .I also believe that an excess of 1,000 H.P. Minimum would be needed to hit 200 M.P.H. to overcome the wind resistence:dontknow:They should of put 200 M.P.H. speedos in these trucks.
    By the way,I,ve also checked a few trucks speedos on a dyno and found them to be accurate to aprox. 150 mph(could not go higher).I can,t wait to see some good calculations!!!:rock:
     
  4. BIG NANA

    BIG NANA Full Access Member

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    Justin,

    Are you assumeing the top speed at 5500RPM in 5th gear? I don't see 6th gear working in this setup. I'm running stock size rear tires and the motor is just a bit warmed up.
     
  5. JMB Justin

    JMB Justin Active Member Preferred Vendor

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    Yes 5th gear, sorry for not being more clear. Best of luck to you!
    Justin
     
  6. ZCx

    ZCx Active Member Supporting Member

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  7. WOT

    WOT Member Supporting Member

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    For those of you that are curious, the gear ratios in the '06 QC automatic are:


    1st-------2.45
    2nd-------1.45
    3rd-------1.0
    4th-------0.69
    R---------2.20
     
  8. BurntRubber

    BurntRubber New Member Supporting Member

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    1st = 50mph
    2nd = 85
    3rd = 124
    4th = 164 @ 5500 rpm
     
  9. BIG NANA

    BIG NANA Full Access Member

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    Well, we'll know after next weekend what the speeds are in 5th at 6000 RPM if it holds to form and I hit Redline at one mile. Hope its over 164MPH!
     
  10. BurntRubber

    BurntRubber New Member Supporting Member

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    good luck BN
     
  11. LoveThisTruck

    LoveThisTruck New Member Supporting Member

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    Go NANA GO!:burnout: :rock:
     
  12. BIG NANA

    BIG NANA Full Access Member

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    Well, we found out tonight on the Dyno at Seans that the top speed is limited to 160MPH at 6000RPM in 5th gear. We will take off the limiter by the end of the week and we're going to bump the redline to 6300RPM, that should allow 168MPH in 5th. Hope so.
     
  13. Hatedonmostly

    Hatedonmostly Has Left the Room - Banned from VTCOA!

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    04 rc has 4.11 correct?? What would be a better gear for street play? 4.56 or 4.88
     
  14. DevilDawg3097

    DevilDawg3097 New Member Supporting Member

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    Hey silverback you big harry beautiful ape. How about calculations for 3.73 and 3.55 please :adore: :adore: :ridinghorse:
     
  15. mysrt10

    mysrt10 Been there, done that Supporting Member

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    Well i'm not silverback but, i found a site and did some homework.
    Here's what i got:

    3.55
    1st 59
    2nd 89
    3rd 122
    4th 158
    5th 214
    6th 317

    3.73
    1st 56
    2nd 84
    3rd 116
    4th 151
    5th 204
    6th 302

    3.91
    1st 54
    2nd 81
    3rd 110
    4th 144
    5th 194
    6th 288

    Looks as though a LOT of power would be needed to pull through 5th and 6th with these ratios.
     
  16. DevilDawg3097

    DevilDawg3097 New Member Supporting Member

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    317 mph:vroam: Good Gosh. Thanks Bro I am more concerned about launch.
     
  17. mysrt10

    mysrt10 Been there, done that Supporting Member

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    Definately 4.88's
     
  18. BurntRubber

    BurntRubber New Member Supporting Member

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    just a comparison...a stock GenIII viper has a 3.07 which is the equivalent of in between a 3.55-3.73 in our trucks. thats how much the weight and big rims hinder us.
     
  19. Leveil22

    Leveil22 Full Access Member

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    What gears would drop my qc rpms at highway speed
     
  20. Slitherbeast

    Slitherbeast Well-Known Member Supporting Member

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    your QC has 4.56 changing to 4.10 would drop highway rpm some. not sure how much! maybe 300 rpm in high gear. easy swap . going taller yet, like 3.91 ,would require a carrier change as well.