Best gear ratio W/ Overdrive

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    Author Topic: Best gear ratio W/ Overdrive  (Read 3480 times)

    Offline Mopar_Mudder

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    Best gear ratio W/ Overdrive
    « on: July 12, 2010 - 02:25:36 PM »
    Going to put a Tremec 5 Speed conversion in a 71 Hemi Cuda. Wondering what opinions are on gear ration. I have it down to 3.73's and 4.10's. With 3.73's 65mph would be 2005rpms and with 4.10's it would be 2204rpm's
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    Offline MEK-Dangerfield

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    Re: Best gear ratio W/ Overdrive
    « Reply #1 on: July 12, 2010 - 03:42:00 PM »
    2200 RPM's is nothing. Go with the 4:10's.
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    Mike

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    Offline BIGSHCLUNK

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    Re: Best gear ratio W/ Overdrive
    « Reply #2 on: July 12, 2010 - 05:24:32 PM »
     :iagree: I'm lots over that w 727/3.23's
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    Offline 422STROKER

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    Re: Best gear ratio W/ Overdrive
    « Reply #3 on: July 12, 2010 - 05:58:05 PM »
    There are 2 different OD ratios from the Tremec trans, I plan on running a 391, thats what I got with the car.  Might be a little light, but motor should have enough tq to make it ok.

    Tom
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    Tom
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    Offline thedodgeboys

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    Re: Best gear ratio W/ Overdrive
    « Reply #4 on: July 12, 2010 - 06:05:34 PM »
     :iagree: I have 4.10's in my car with a 27 inch tall tire and a .50 6th gear at 70MPH i hit 1900 rpm's
    check this out scroll down to the bottom.
    http://www.csgnetwork.com/multirpmcalc.html
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    Offline 73EStroker

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    Re: Best gear ratio W/ Overdrive
    « Reply #5 on: July 12, 2010 - 09:25:45 PM »
    I run 3.73 with a 0.8 OD in a Passon OD. Gives good pulling power right from 60mph if one is too lazy to shift down. 2500 RPM = 80mph. The engine would pull easily 6000 in OD but the body would float way earlier than that speed. Go with the 4:10s and the 0.6 OD
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    Barry (Salmon Arm)

    Offline IMNCARN82

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    Re: Best gear ratio W/ Overdrive
    « Reply #6 on: July 13, 2010 - 08:51:16 AM »
    3:91's + TKO = +27 m.p.h. top end!!  I think it's the long stroke.Not sure. But I can drive on the freeway now. :icon16:   
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    Offline Robb

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    Re: Best gear ratio W/ Overdrive
    « Reply #7 on: July 13, 2010 - 04:30:04 PM »
    I have the TKO 500 600  with .64 OD and 25.5 inch tall rear tires.  and started out with 3.55 gears
    First gear was only good for about 20 feet and then had to shift to second right away.  Almost didnt need 1st gear ?  That was just driving, not taking off with the pedal down...

    my focus is on street drivability and I found that to be annoying.

    I switched  to 3.23 gears and have been a lot happier with it since.

    Tire height is an important factor in the equation.
    « Last Edit: July 14, 2010 - 01:59:54 AM by Robb »
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    Offline Mopar_Mudder

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    Re: Best gear ratio W/ Overdrive
    « Reply #8 on: July 13, 2010 - 05:04:28 PM »
    I was looking at the 600 version which has the 2.87 first -vrs- the 3.27 first in the 500 version.
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    Offline Robb

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    Re: Best gear ratio W/ Overdrive
    « Reply #9 on: July 14, 2010 - 02:01:45 AM »
    oops.   :-X    I have the 600 not the 500.   Good luck with your Choice.   You can always change it if you dont like it.   :)
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    70 Challenger SE  (440 SIX PACK / Keisler 5 speed, R/T SE replication)       68 Sport Satellite Convertible 383 Super Commando / 727  Survivor

    2002 Trans AM WS6 convertible:  DD
    1999 4Runner 4x4:  lifted-locked-armored  expedition vehicle
    1990 Jeep XJ 4x4:  Front Dana 60, GM-14bolt rear, 3 link, 4link, 5.38 detroits, beadlocked 40's, stretched to 110" wb  Rock Crawler

    Offline Mopar_Mudder

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    Re: Best gear ratio W/ Overdrive
    « Reply #10 on: July 14, 2010 - 11:02:47 AM »
    Quote from: Robb on July 14, 2010 - 02:01:45 AM
    oops.   :-X    I have the 600 not the 500.   Good luck with your Choice.   You can always change it if you dont like it.   :)

    Yea I think I can about change Dana 60 gears in my sleep.

    First gear should be good for about 40mph with 4:10 gears and 26" tires
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    1971 Hemi Cuda

    2005 SRT-10 Regular Cab Flame Red.   12.771 @ 109.67 <-----Time Slip --Video
    Mopar: Headers, Exhaust, Ram Air, ECM

    2008 3500 Mega Cab Dually, Resistal Edition
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