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Thread: Allison auto box advice

  1. #1
    4 Star General dmetalmiki's Avatar
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    Default Allison auto box advice

    Well gents, Here's a nifty problem for you (All) to have a go at.
    The Diamond T I have now, Is fitted with a four speed auto truck gearbox. Just like some fitted to the Bin (Refuse) wagons. (And buses?).
    You can select 1 2 3 4 or R.
    You can set of in 4, and it does the Auto thing. up and down
    There is a neutral but NO Park selection.
    I have the original LOW-DIRECT_OVERDRIVE Aux box working.

    How can I fit (something(Anything)) or modify FROM the outside of the gearbox A,
    DISCONNECT? Like a fork truck 'shunt' (Clutch)pedal?.
    Mechanically OR hydraulically?.
    WHY?
    I NEED to disconnect/slip/ freewheel When 'SHUNTING My trailer.
    Before you yell. "It should freewheel at tickover or low RPMs"), It does. ONLY in overdrive 4th. or Reverse.
    But in direct or low, Forget it! the engine easily overcomes the brakes just at the speed I feel is SAFE to shunt.
    Allison just say it can't be done, and or don't mess with it due to lubrication failure.
    Go to it gents, Prove it CAN be done. Somehow..Anyhow!. Thanks in advance.
    There are NO identity plates on the box which is annoying as I wanted to obtain some specifications diagrams schematics or data sheets.."Over".
    DIAMOND T M20.
    M54A2 I.H. M62. wrecker
    M54A2 5 Ton (with Radio Body. ex praga command station)
    M45 530C fire truck
    M561 Gamma Goat
    1942 Ford Jeep (with underfloor tulsa winch)
    1945 Willys Jeep (with V8 flathead Engine) And now 'that' overdrive'..

  2. #2
    4 Star General NDT's Avatar
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    Default

    Sounds like your engine idle speed is too high on your DFXE. None of us know what shunting is over here.

  3. #3
    4 Star General dmetalmiki's Avatar
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    Default

    Idle is set right.
    Shunting is just that, Pushing or pulling stuff into position, (Ah-lah Rail shunting Locomotives(Heavy locomotive actually is what my M.62.wrecker is registered as)).
    All other factors being equal. I would like to have a disconnect to be able to use the auxiliary gearbox 'on the fly'. As well as for shunting.
    After all, I DO use the clutch on my M.62. When 'shunting'.
    And on my fork truck which has a 'Hydraulic release' Pedal. Which is what I am seeking actually.
    Last edited by dmetalmiki; 03-09-2019 at 15:48. Reason: keyboard
    DIAMOND T M20.
    M54A2 I.H. M62. wrecker
    M54A2 5 Ton (with Radio Body. ex praga command station)
    M45 530C fire truck
    M561 Gamma Goat
    1942 Ford Jeep (with underfloor tulsa winch)
    1945 Willys Jeep (with V8 flathead Engine) And now 'that' overdrive'..

  4. #4
    4 Star General snowtrac nome's Avatar
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    Default

    on the forklift the left pedal applies a brake and declutches the transmission. of all the forklifts I have worked on I have never had to open up a transmission to see how it happens. I suspect its an internal clutch at the output end of the transmission and not inside the torque converter. I suspect what you want to do is not going to be a simple or affordable action

  5. #5
    4 Star General dmetalmiki's Avatar
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    Roger that. I almost already know this option is going to be a ;challenge'. But I am still hoping that a 'Release' can be performed hydraulically. An Allison dealer over here is looking into that for me.
    Others have suggested doing it like the 432 A.P.C. Allison Auto box does it.
    But that option is for towing only and is a total disconnect mechanically Via a Dog Clutch.
    So, The research, and options go on.
    Last edited by dmetalmiki; 03-09-2019 at 17:02. Reason: error
    DIAMOND T M20.
    M54A2 I.H. M62. wrecker
    M54A2 5 Ton (with Radio Body. ex praga command station)
    M45 530C fire truck
    M561 Gamma Goat
    1942 Ford Jeep (with underfloor tulsa winch)
    1945 Willys Jeep (with V8 flathead Engine) And now 'that' overdrive'..

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