5.7 Hemi, 70 SE Challenger, standard transmission?

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    Author Topic: 5.7 Hemi, 70 SE Challenger, standard transmission?  (Read 5669 times)

    Offline Challenger6pak

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    5.7 Hemi, 70 SE Challenger, standard transmission?
    « on: December 24, 2010 - 07:02:59 PM »
    I am planning to put a 5.7 Hemi in my SE.  It was converted (properly) to a 4 speed years ago.  It needs the drivers floor replaced.  Now would be the time to go back to automatic if it is needed for the 5.7 Hemi.  Does anyone know if a 5.7 pattern standard trans is available and will work in a 70 Challenger?  I do not want to modify the 5.7.  The goal is to get the mileage of a 340 with more power and drivability.  I plan to drive this car to shows that are at least 200 miles away from my home. In the past the 4 speed has added some performance and some gas mileage.  If the auto with the 5.7 will give me the same performance as the standard shift 5.7, I will stick with the auto trans.  I need 4 speed parts for my Cuda anyway.    Thanks,
    Tod
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    1969 Sport Satellite H code convertible, 1970 Cuda 440+6, 1970 Challenger R/T 440+6, 1970 Challenger 383 R/T auto, 1970 Challenger R/T 383 4 speed,1971 Challenger convertible.


    Offline Chryco Psycho

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #1 on: December 24, 2010 - 08:00:00 PM »
    to get the 518 trans into the tunnel the T bar crossmember needs to be enlarged /worked to fit it
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    Offline Challenger6pak

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #2 on: December 24, 2010 - 08:46:16 PM »
    I am familiar with that modification behind a 340 motor.  Is there a good 5 or 6 speed manual transmission for the 5.7?  Can it be used easily in a Challenger?
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    Offline thedodgeboys

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #3 on: December 24, 2010 - 09:15:27 PM »
    Quote from: Challenger6pak on December 24, 2010 - 08:46:16 PM
    I am familiar with that modification behind a 340 motor.  Is there a good 5 or 6 speed manual transmission for the 5.7?  Can it be used easily in a Challenger?


    Yes maybe no  :clueless:  :faint:
    you can put a tremec tko 5 speed in with a few mods and passion has a new one thats based off of the mopar 4 speed case size but its expensive. you can go 6 speed if you don,t mind cutting your cross member out and rebuilding it to make room for the larger case.

    your 4 speed will bolt up with a new hemi flywheel BTW  :working:

    I did the 6 speed in my challenger if you have more questions, good luck enjoy your 5.7.
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    Offline Challenger6pak

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #4 on: December 24, 2010 - 10:05:27 PM »
    Is the perfomance nearly identical with the 6 speed and the automatic?  I know the factory automatic is more readily available which will make it a cheaper conversion.  I am new to this.  Are people using the same automatic that is found in the 300? 
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    1969 Sport Satellite H code convertible, 1970 Cuda 440+6, 1970 Challenger R/T 440+6, 1970 Challenger 383 R/T auto, 1970 Challenger R/T 383 4 speed,1971 Challenger convertible.

    Offline heminut

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #5 on: December 25, 2010 - 01:16:16 AM »
    The 5.7 has the same bellhousing bolt pattern as the LA engines. Once you get the proper flywheel or flexplate virtually any trans that bolts to a Mopar smallblock will bolt to the new hemi.
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    Offline Chryco Psycho

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #6 on: December 25, 2010 - 02:09:45 PM »
    the best fit is probably the 727 with the GV overdrive
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    Offline Challenger6pak

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #7 on: December 25, 2010 - 02:57:23 PM »
    Quote from: Chryco Psycho on December 25, 2010 - 02:09:45 PM
    the best fit is probably the 727 with the GV overdrive
    I have heard the GV unit is unreliable.  Is this true?

    Quote from: heminut on December 25, 2010 - 01:16:16 AM
    The 5.7 has the same bellhousing bolt pattern as the LA engines. Once you get the proper flywheel or flexplate virtually any trans that bolts to a Mopar smallblock will bolt to the new hemi.
    I did not know this.  It makes things clearer.  So, I could even keep my 833 with the 5.7?  I would like overdrive.  Is there a good 5 or 6 speed that will work with the 5.7 and my Challenger 4 speed tunnel, etc?  Thanks for all the information.
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    1969 Sport Satellite H code convertible, 1970 Cuda 440+6, 1970 Challenger R/T 440+6, 1970 Challenger 383 R/T auto, 1970 Challenger R/T 383 4 speed,1971 Challenger convertible.

    Offline heminut

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #8 on: December 25, 2010 - 03:09:39 PM »
    Yes you could keep your 833, Mopar Performance has a 130 tooth flywheel for the 5.7 and everything else should bolt up. I have a small block 727 behind mine, and if I can get my hands on a reasonably priced 518 down the road I will probably swap it out.
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    Offline MJS73

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #9 on: December 30, 2010 - 11:42:46 AM »
    Quote from: Challenger6pak on December 25, 2010 - 02:57:23 PM
    I have heard the GV unit is unreliable.  Is this true?

    I can confirm that this is NOT true. Mine has worked flawlessly for two years now.
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    Offline Challenger6pak

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #10 on: December 30, 2010 - 01:05:21 PM »
    Thats good to know. I am going to put the car back to an automatic and would like to use the gear venders so I don't have to cut up anything in the car.  Can you tell me more about the gear venders unit?  Thanks,
    Tod
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    1969 Sport Satellite H code convertible, 1970 Cuda 440+6, 1970 Challenger R/T 440+6, 1970 Challenger 383 R/T auto, 1970 Challenger R/T 383 4 speed,1971 Challenger convertible.

    Offline Chryco Psycho

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    Re: 5.7 Hemi, 70 SE Challenger, standard transmission?
    « Reply #11 on: December 30, 2010 - 08:58:13 PM »
    I have a few customers with the GV unit & no problems , it is well designed & a HD part
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