Converting to automatic transmission

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

  1. Jakester1017

    Jakester1017 Bobtail Member

    Joined:
    Jan 22, 2020
    Messages:
    1
    Thanks Received:
    0
    0
    I currently have a 1978 r Mack twin stick wanted to see if it’s possible to put an automatic transmission in it
     
  2. 201

    201 Road Train Member

    Joined:
    Apr 16, 2014
    Messages:
    12,275
    Thanks Received:
    25,057
    Location:
    high plains colorado
    0
    What's wrong with the 2 sticker? I'd have to think switching over would be a huge hassle.
     
    BUMBACLADWAR and Bean Jr. Thank this.
  3. Dave1837

    Dave1837 Road Train Member

    Joined:
    Nov 16, 2019
    Messages:
    1,398
    Thanks Received:
    4,342
    Location:
    Pennsylvania
    0
    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
     
    BUMBACLADWAR and Bean Jr. Thank this.
  4. Bean Jr.

    Bean Jr. Road Train Member

    Joined:
    Mar 30, 2014
    Messages:
    5,500
    Thanks Received:
    9,782
    0
    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

    Joined:
    May 25, 2017
    Messages:
    13,562
    Thanks Received:
    34,821
    Location:
    under a shade tree
    0
    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.....
     
    BUMBACLADWAR Thanks this.
  6. spsauerland

    spsauerland Road Train Member

    Joined:
    May 31, 2010
    Messages:
    4,296
    Thanks Received:
    10,887
    Location:
    West Harrison, In
    0
    Find an older non electrical Allison. Finding flexplate might be a bear.
     
    Bean Jr. Thanks this.
  7. Chubby Fly

    Chubby Fly Medium Load Member

    Joined:
    Nov 25, 2019
    Messages:
    569
    Thanks Received:
    797
    0
    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
     
    Bean Jr. Thanks this.
  8. BUMBACLADWAR

    BUMBACLADWAR Road Train Member

    Joined:
    Dec 5, 2013
    Messages:
    1,899
    Thanks Received:
    1,923
    0
    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
     
    buddyd157 and Bean Jr. Thank this.
  9. 201

    201 Road Train Member

    Joined:
    Apr 16, 2014
    Messages:
    12,275
    Thanks Received:
    25,057
    Location:
    high plains colorado
    0
    If it's a 2 stick 6 speed, that was the "lazy man's" truck.
     
    buddyd157 Thanks this.