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    Author Topic: Switching out 3:23 to 3:55 gears in a 489 case  (Read 759 times)

    Offline cv70chall

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    • 1970 Challenger
    Switching out 3:23 to 3:55 gears in a 489 case
    « on: March 19, 2016 - 02:35:35 PM »
    Thinking about doing this. We'll have the rear end apart to install the sure grip, so it's an opportunity. Anything special I need to know?
    I'll need tp purchase a set of gears and want to know the exact part to look for.

    Thanks
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    Offline Chryco Psycho

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    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    Re: Switching out 3:23 to 3:55 gears in a 489 case
    « Reply #1 on: March 19, 2016 - 11:49:23 PM »
    why not order a new carrier from DR Diff with suregrip & new gears that way you can use or sell the 3.23 set
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    Offline dfrazz

    • 1970 Cuda - 1968 Charger
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    Re: Switching out 3:23 to 3:55 gears in a 489 case
    « Reply #2 on: March 20, 2016 - 10:42:12 AM »
    Is 3.23 to 3.55 really that big of step?  I would consider maybe an even lower gear.
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    Offline minivan

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    Re: Switching out 3:23 to 3:55 gears in a 489 case
    « Reply #3 on: March 20, 2016 - 11:19:22 AM »
      If  driven on the freeway it will be a definite difference.
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    Offline Brillo1974

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    Re: Switching out 3:23 to 3:55 gears in a 489 case
    « Reply #4 on: March 20, 2016 - 05:28:30 PM »
    From looking at the page that was posted in my thread it will probably raise your rpm about 350 at 70 mph going to a 355. http://vexer.com/automotive-tools/speed-rpm-calculator
    « Last Edit: March 20, 2016 - 05:31:29 PM by Brillo1974 »
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