Converting to automatic transmission

Discussion in 'Mack Forum' started by Jakester1017, Jan 22, 2020.

  1. Jakester1017

    Jakester1017 Bobtail Member

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    Jan 22, 2020
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    I currently have a 1978 r Mack twin stick wanted to see if it’s possible to put an automatic transmission in it
     
  2. "semi" retired

    "semi" retired Road Train Member

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    What's wrong with the 2 sticker? I'd have to think switching over would be a huge hassle.
     
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  3. Dave1837

    Dave1837 Light Load Member

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    I'm sure it's possible but the aggravation of finding an automatic that could pair up to that engine would be way more than shifting 2 sticks lol especially one that's in good condition
     
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  4. Bean Jr.

    Bean Jr. Road Train Member

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    Are you thinking of an auto shift or putting in an Allison? Auto shift should require an engine with an ecm.
     
  5. buddyd157

    buddyd157 Road Train Member

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    anyone with money, can do anything.

    transmission, transmission to engine adapter, transmission cross member, drive shaft(s), plumbing, maybe wiring...

    yup, it can be done.

    or do a complete resto-mod, with new engine, transmission, and all associated parts.

    yup.....money talks, BS walks.....
     
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  6. spsauerland

    spsauerland Road Train Member

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    Find an older non electrical Allison. Finding flexplate might be a bear.
     
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  7. Chubby Fly

    Chubby Fly Light Load Member

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    Curious as to why you would want to do that to a 78 Mack r. Is this a restored truck that you use as your money maker? If not, and it’s just a toy, getting rid of the 5 speed and putting a auto in it will break enthusiasts hearts everywhere
     
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  8. BUMBACLADWAR

    BUMBACLADWAR Road Train Member

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    Maybe an automatic out of an 80's school bus? And some custom bell housing fabrication/ drive shaft length etc. Im getting frustrated just contemplating it.JMO
     
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  9. "semi" retired

    "semi" retired Road Train Member

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    If it's a 2 stick 6 speed, that was the "lazy man's" truck.
     
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