Auto VS. 4 Speed RPM

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    Author Topic: Auto VS. 4 Speed RPM  (Read 1283 times)

    Offline mjb765

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    Auto VS. 4 Speed RPM
    « on: September 29, 2011 - 09:18:29 AM »
    Given all other things equal, which would give you lower highway cruising rpm--an A833 4 speed (non OD) or a 727 Auto??
    I think the final on the 4 speed is 1:1, I am not sure about the ratio of 3rd on the Auto.
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    Offline Chryco Psycho

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    Re: Auto VS. 4 Speed RPM
    « Reply #1 on: September 29, 2011 - 09:28:34 AM »
    both are 1:1 in high gear , you will get some slippage in the converter so you lose about 3% with the Auto
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    Offline mjb765

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    Re: Auto VS. 4 Speed RPM
    « Reply #2 on: September 29, 2011 - 09:31:53 AM »
    3% I can live with.....I was looking at at Auto car and was wondering what the difference would be. Also thinking of a 4 speed conversion, but that's a lot of work. If I went that far, I would put a 5 speed in it....just thinking out loud.

    Thanks for the quick answer!
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    Offline Chryco Psycho

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    Re: Auto VS. 4 Speed RPM
    « Reply #3 on: September 29, 2011 - 09:34:20 AM »
    glad to help  :2thumbs:
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    Offline Cooter

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    Re: Auto VS. 4 Speed RPM
    « Reply #4 on: September 29, 2011 - 01:25:12 PM »
    3% on a STOCK torque converter....once you step up to a High Stall converter, better re-think that automatic..
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    Offline 360FISH

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    Re: Auto VS. 4 Speed RPM
    « Reply #5 on: September 29, 2011 - 01:32:47 PM »
     You could consider an A518 conversion.  Less work on the car to accomplish, cheaper to do... fewer parts to buy and install.
    I'm about 3 weeks away from doing my install.
    Will have a nice overdrive tranny when done.
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    Offline vinb

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    Re: Auto VS. 4 Speed RPM
    « Reply #6 on: September 29, 2011 - 07:56:27 PM »
    All depends on your convertor, When I went to the 4spd I notice 250-300 rpm difference..
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    Offline Cooter

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    Re: Auto VS. 4 Speed RPM
    « Reply #7 on: September 30, 2011 - 07:51:33 AM »
    Quote from: 360FISH on September 29, 2011 - 01:32:47 PM
    You could consider an A518 conversion.  Less work on the car to accomplish, cheaper to do... fewer parts to buy and install.
    I'm about 3 weeks away from doing my install.
    Will have a nice overdrive tranny when done.

    As long as you don't mind hacking the tunnel and crossmember to get it in there, your good....

    The 518 isn't all that great a swap. Some talk about the "Hacking" needed to get a Kiesler Manual in their cars yet, when it comes to the 518 hanging all down under the car with a heavily modded crossmember, they tend to "Accept" it....
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    Offline Chryco Psycho

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    Re: Auto VS. 4 Speed RPM
    « Reply #8 on: September 30, 2011 - 09:29:34 AM »
    if you select the right stall converter you should be above the stall speed @ highway speeds but a 300 rpm loss would be normal
    The manual will always return better milage as there is less moving parts / weight + you do not have to pump the fluid around
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    Offline 360FISH

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    Re: Auto VS. 4 Speed RPM
    « Reply #9 on: October 01, 2011 - 12:55:36 AM »
    Quote from: Cooter on September 30, 2011 - 07:51:33 AM
    As long as you don't mind hacking the tunnel and crossmember to get it in there, your good....

    The 518 isn't all that great a swap. Some talk about the "Hacking" needed to get a Kiesler Manual in their cars yet, when it comes to the 518 hanging all down under the car with a heavily modded crossmember, they tend to "Accept" it....
    Well, I should know for sure in a few weeks, but the write-ups from people doing this with their e-bodies suggest otherwise.  Specifically regarding the tunnel and cross member.  The modification is done to the tranny, to make it fit.  Certainly nothing like adding a 4 speed hump for a manual.
    The tranny mount has to be modified and the drive shaft shortened, again nothing too major (or so they say).

    I'll report back with details when it's done.

    Alan
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    Offline Cooter

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    Re: Auto VS. 4 Speed RPM
    « Reply #10 on: October 01, 2011 - 10:27:55 AM »
    Might wanna check this out first...It's a B body, but I can't see an E body being much different being they share the same 4-speed tail housing..

    http://www.hotrod.com/howto/43323_mopar_overdrive_transmission_swap/
    « Last Edit: October 01, 2011 - 10:29:35 AM by Cooter »
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    Offline Matt70

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    Re: Auto VS. 4 Speed RPM
    « Reply #11 on: October 01, 2011 - 10:33:34 AM »
    My Challenger has a 518, no hacking was needed.
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    Offline mjb765

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    Re: Auto VS. 4 Speed RPM
    « Reply #12 on: October 01, 2011 - 11:23:31 AM »
    The article on the swap was an interesting read.......the reason I asked the original question is that I was looking at another car (which had an auto--I already own a 4 speed) and was curious on the difference in rpm between the 4 sp and the auto.

    But just for conversation's sake....wouldn't a gear vendors overdrive unit be an easier add on??
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    Offline Cooter

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    Re: Auto VS. 4 Speed RPM
    « Reply #13 on: October 01, 2011 - 01:47:48 PM »
    Well, the way I understand it, the Gear Vendors OD unit is a bolt in, but hella expensive..Plus tricky to understand that button when splitting ratios. 1st-1st over..2nd-2nd over...3rd-3rd over...4th- 4th over...
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    1968 Dodge Dart 2dr sedan 505" Stroker    (O]=0==========0=[O)                
    1970 Challenger R/T Clone "Kowalski Special"   (OO) [___________] (OO)

    Offline mopar12372

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    Re: Auto VS. 4 Speed RPM
    « Reply #14 on: October 01, 2011 - 02:00:11 PM »
    where the engine is located in the b body its the same to the e body  . drive shaft length is where its  different wich would be the same for a engine transplant .

    hurry up and get that thing done i want to see it...................................................... :bigsmile:
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