Auto VS. 4 Speed RPM

News:

  • Home
  • Help
  • Chat
  • Login
  • Register

    • « previous next »
    Pages: [1] 2

    Author Topic: Auto VS. 4 Speed RPM  (Read 1288 times)

    Offline mjb765

    • Full Member
    • ***
    • Posts: 660
    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.
    Logged


    Offline Chryco Psycho

    • Administrator
    • C-C.com Guru
    • *****
    • Posts: 36620
    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    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
    Logged

    Challenger - You`ll wish You Hadn`t

    Offline mjb765

    • Full Member
    • ***
    • Posts: 660
    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!
    Logged

    Offline Chryco Psycho

    • Administrator
    • C-C.com Guru
    • *****
    • Posts: 36620
    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    Re: Auto VS. 4 Speed RPM
    « Reply #3 on: September 29, 2011 - 09:34:20 AM »
    glad to help  :2thumbs:
    Logged

    Challenger - You`ll wish You Hadn`t

    Offline Cooter

    • Sr. Member
    • ****
    • Posts: 1207
    • There goes the lone Challenger............
      • christinecarclub.com
    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..
    Logged
    1958 plymouth Belvedere 2dr hd top "Christine" [OO)====V====(OO]
    1969 dodge Charger "General Lee"         [___|______I______|___]                        
    1968 Dodge Dart 2dr sedan 505" Stroker    (O]=0==========0=[O)                
    1970 Challenger R/T Clone "Kowalski Special"   (OO) [___________] (OO)

    Offline 360FISH

    • Full Member
    • ***
    • Posts: 705
    • BS23H3B567746
    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.
    Logged
    1973 ‘Cuda   Semi-Pro Touring
    360 SB - 518/OD auto tranny - FAST EZ EFI - Edelbrock Fuel sump - HHR fan
    Hella H4 headlights on relays - 97 Dodge Avenger seats - Chin spoiler - Bumpers pulled in to ’72 offset

    Build: http://www.cuda-challenger.com/cc/index.php?topic=74674.0

    Offline vinb

    • Resident
    • *****
    • Posts: 2163
    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..
    Logged

    Offline Cooter

    • Sr. Member
    • ****
    • Posts: 1207
    • There goes the lone Challenger............
      • christinecarclub.com
    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....
    Logged
    1958 plymouth Belvedere 2dr hd top "Christine" [OO)====V====(OO]
    1969 dodge Charger "General Lee"         [___|______I______|___]                        
    1968 Dodge Dart 2dr sedan 505" Stroker    (O]=0==========0=[O)                
    1970 Challenger R/T Clone "Kowalski Special"   (OO) [___________] (OO)

    Offline Chryco Psycho

    • Administrator
    • C-C.com Guru
    • *****
    • Posts: 36620
    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    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
    Logged

    Challenger - You`ll wish You Hadn`t

    Offline 360FISH

    • Full Member
    • ***
    • Posts: 705
    • BS23H3B567746
    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
    Logged
    1973 ‘Cuda   Semi-Pro Touring
    360 SB - 518/OD auto tranny - FAST EZ EFI - Edelbrock Fuel sump - HHR fan
    Hella H4 headlights on relays - 97 Dodge Avenger seats - Chin spoiler - Bumpers pulled in to ’72 offset

    Build: http://www.cuda-challenger.com/cc/index.php?topic=74674.0

    Offline Cooter

    • Sr. Member
    • ****
    • Posts: 1207
    • There goes the lone Challenger............
      • christinecarclub.com
    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 »
    Logged
    1958 plymouth Belvedere 2dr hd top "Christine" [OO)====V====(OO]
    1969 dodge Charger "General Lee"         [___|______I______|___]                        
    1968 Dodge Dart 2dr sedan 505" Stroker    (O]=0==========0=[O)                
    1970 Challenger R/T Clone "Kowalski Special"   (OO) [___________] (OO)

    Offline Matt70

    • Full Member
    • ***
    • Posts: 868
    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.
    Logged
    People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf.

    George Orwell

    Offline mjb765

    • Full Member
    • ***
    • Posts: 660
    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??
    Logged

    Offline Cooter

    • Sr. Member
    • ****
    • Posts: 1207
    • There goes the lone Challenger............
      • christinecarclub.com
    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...
    Logged
    1958 plymouth Belvedere 2dr hd top "Christine" [OO)====V====(OO]
    1969 dodge Charger "General Lee"         [___|______I______|___]                        
    1968 Dodge Dart 2dr sedan 505" Stroker    (O]=0==========0=[O)                
    1970 Challenger R/T Clone "Kowalski Special"   (OO) [___________] (OO)

    Offline mopar12372

    • Sr. Member
    • ****
    • Posts: 1163
      • mopartech
    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:
    Logged
    MOPARTECH.NET ( come over and visit some time )
    RESTO PICTURES
    http://www.cuda-challenger.com/cc/index.php?topic=71096.30
    Pages: [1] 2
    « previous next »