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Thread: 4.10 or 3.91?

  1. 09-28-2005, 04:45 PM #1
    formulabird06
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    4.10 or 3.91?

    what would be better for a firebird with a 305? im about to put an 89 trans am rear end on and havent really made up my mind on gearing? any suggestions?
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  2. 09-28-2005, 05:16 PM #2
    mcamp001
    mcamp001 is offline
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    depends on current/future mods, what you are looking for. What are you trying to do with the car? Daily Driver? What trans? Ratios?. Sorry, not enough info to make a recommendation
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  3. 09-30-2005, 04:58 PM #3
    formulabird06
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    3.91 or 4.10

    it has a 350 transie and hope to stroke it out to a 383. it will pretty much be a daily driver when weather is nice.
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  4. 10-04-2005, 08:44 AM #4
    Ric
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    If you're runnin a TH-350 trans, then you're gonna want about a 3.55 at the lowest, considering those aren't overdrive units. You'll tach over 3000 rpm at 60 with 3.91s, more still with 4.10s.
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