Eaton 12 spd auto

Discussion in 'Heavy Haul Trucking Forum' started by cool7035, Nov 14, 2021.

  1. cool7035

    cool7035 Bobtail Member

    Aug 6, 2013
    Rusk, Texas
    I don't do much, but occasionally I pull a mechanical RGN. And while I'm indifferent either way, I have an option to get the Eaton Auto shift in a new truck. And simply for the extra ratios vs just a 9 spd manual, I'm considering it.

    The question I have is do any of you pull a mechanical RGN with an Eaton auto shift, or any auto for that matter. 75% of my freight is step or flat, but occasionally I get a RGN load. And I'm concerned about hooking up to a mechanical neck with an auto.
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  3. Landincoldfire

    Landincoldfire Medium Load Member

    Sep 27, 2015
    New Holland, Pa
    Company trucks in our fleet are automatic and they pull a lot of mechanical RGNs. I only have heard issues when they get stuck or have to raise their air suspension. The latter doesn't even pertain to your question and is an easy fix from the factory.
    stwik, beastr123, Oxbow and 2 others Thank this.
  4. BackwoodsGA

    BackwoodsGA Road Train Member

    Mar 18, 2012
    savannah GA
    They do good.Ran one 1.2mill no issues and always hauled 45k and up.
    cke and beastr123 Thank this.
  5. Arch Stanton

    Arch Stanton Light Load Member

    May 5, 2019
    San Diego
    I am running the 18 speed auto shift on 3 trucks 2 dump trucks and 1 Lowbed with Murray mechanical rgn I like it but it is not as smooth as a clutch the standard program from the factory will need to be changed I like the performance shifting program I find the heavy haul configuration is too aggressive you will want the blend pedal clutch configuration in reverse and low in your primary shifting program blend pedal makes your throttle pedal work as the clutch for the first part of the travel until fully engaged then it works as a throttle again you can also drag the brake in this mode there is just a ton of things that can be programmed into this Tranmission and the dealer was not much help you will need the eaton rep to go over the options with you to get it right
    Now for the 12 speed I don't think the ratios are correct for the application and I have heard that the paccar 12 speed has aluminum case and they have had lots of failures on low mile trucks I don't know if the paccar and eaton 12 speed have anything in common but due a lot of research before buying a 12 speed.
    If you are going to spend the extra $ for the auto shift I would go for the 18speed the low reverse is what you need to for the RGN
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