TR-6060 Gear vs Speed

Discussion in 'Dodge Challenger General Discussions' started by Farmer Fran, May 15, 2021.

  1. Farmer Fran

    Farmer Fran Full Access Member

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    Anyone have the gear vs speed chart for the 2021 (392 Scat Pack?) my search FU is terrible.

    390 final?

    Thanks,
    Fran
     
    Last edited: May 15, 2021
  2. Wizard of Iz

    Wizard of Iz Full Access Member

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    Sending you some info. But not exactly what you want.


    Sent from my iPad using Tapatalk
     
  3. Farmer Fran

    Farmer Fran Full Access Member

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    Thank you. After looking at the chart, I came up with this; I was looking for the "maximum" speed in each gear (1 through 4) for shifting, up or down.

    Assuming the TR-6060 in the 2021 392 Scat Pack is

    Gear Ratio Calculator (tremec.com)

    3.9 Final

    TR-6060 Gearing
    1st = 2.97
    2nd = 2.10
    3rd = 1.46
    4th = 1.00
    5th = 0.74
    6th = .05
    R = 2.90

    Tire height of 28.4" (305/35-R20)

    6000 RPM
    1 = 44
    2 = 62
    3 = 89
    4 = 130

    6400 RPM
    1 = 47
    2 = 66
    3 = 95
    4 = 139
     
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  4. TRCM

    TRCM Full Access Member

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    That tire size only comes on the widebody version of the scat pack....
     
  5. Farmer Fran

    Farmer Fran Full Access Member

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    This is true but the only thing that matters is the tire diameter

    So if you are running the 275/40-R20 the math is about the same. Less than or about 1mph.
     
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  6. TRCM

    TRCM Full Access Member

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    true, as long as the tire height is the same
     
  7. Farmer Fran

    Farmer Fran Full Access Member

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    They are 28.4 vs. 28.6 -- but each person would have to do their own math
     
  8. Darrell Feit

    Darrell Feit Member

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    My 2021 Scat Pack has 275/40R/20 on the rear. The speedo shows the identical speed as the Garmin Navigation unit.