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  1. #21
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    Default Re: Automatic gearboxes and towing heavy loads

    Not sure which vehicle you will use for towing, but if the Range Rover, it might be the same as the Discovery 4 (2010) which senses if you pull a trailer and then 'adjusts' the way the gearbox changes gears. The sensing is done by looking if something is connected to the trailer plug and will show up on dashboard, if it is. If it compensates enough for such a heavy trailer, I don't know and other advice already given might work better.

    Please take note that with LED lights on the trailer, the Discovery does not sense a trailer and does not make the adjustment. I learnt the expensive way.

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  3. #22
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by PieterN View Post
    Please take note that with LED lights on the trailer, the Discovery does not sense a trailer and does not make the adjustment. I learnt the expensive way.
    What went wrong with the LED trailer lights? I have a trailer with LED’s and would need to compensate if i can.
    2011 Range Rover Vogue SE 4.4 TDV8
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  4. #23
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by williepvjr View Post
    What went wrong with the LED trailer lights? I have a trailer with LED’s and would need to compensate if i can.
    I have a little box on my BL to compensate for the led's of the trailer.The RR then picks up that I am towing and adjusts shift pattern.Kick-back earlier and hold gears slightly longer.Tow in D.
    2012 RR TDV8 4.4
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  5. #24
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by DiscoFrans View Post
    I have a little box on my BL to compensate for the led's of the trailer.
    Seems ill need to do something here… I am not seeing the little light on the dash indicating the tow connection (the manual says it should blink with the indicators - this is not happening).

    Tell me about the little box and the bl pls?
    Last edited by williepvjr; 2021/09/27 at 01:45 PM.
    2011 Range Rover Vogue SE 4.4 TDV8
    2016 BMW 125i M Sport

  6. #25
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by williepvjr View Post
    Seems ill need to do something here… I am not seeing the little light on the dash indicating the tow connection (the manual says it should blink with the indicators - this is not happening).

    Tell me about the little box and the bl pls?
    the car measures resistance on each circuit to see if the light bulbs are ok, on an LED the car will see an open circuit so assumes nothing is plugged in. What you need is some big resistors to wire in parallel to the LED lights, car will see the resistance in the circuit and know there is a trailer hitched up.

    Some people make up a little box you plug into the cable, I just wired in resistors at the LED lights on my trailer.

    edited to add, at R300 I'd just buy this:
    https://www.takealot.com/led-trailer...B&gclsrc=aw.ds
    Last edited by mullerza; 2021/09/27 at 02:05 PM.
    Anton Muller

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  8. #26
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by mullerza View Post
    the car measures resistance on each circuit to see if the light bulbs are ok, on an LED the car will see an open circuit so assumes nothing is plugged in. What you need is some big resistors to wire in parallel to the LED lights, car will see the resistance in the circuit and know there is a trailer hitched up.

    Some people make up a little box you plug into the cable, I just wired in resistors at the LED lights on my trailer.

    edited to add, at R300 I'd just buy this:
    https://www.takealot.com/led-trailer...B&gclsrc=aw.ds
    I did try the unit that Ford use for the bakkie but it did not work on the LR.I bought a used box from Aus that is for LR.One can use it without the box but the car electronics will not pick the trailer up.Used my D3 like that with no ill effects,the led just flash like disco lights!!
    2012 RR TDV8 4.4
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  9. #27
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by DiscoFrans View Post
    I did try the unit that Ford use for the bakkie but it did not work on the LR.I bought a used box from Aus that is for LR.One can use it without the box but the car electronics will not pick the trailer up.Used my D3 like that with no ill effects,the led just flash like disco lights!!
    Good to know,wonder why the landrover is so finiky?
    Anton Muller

    "That which can be asserted without evidence, can be dismissed without evidence." Christopher Hitchens.

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  10. #28
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by mullerza View Post
    Good to know,wonder why the landrover is so finiky?
    No idea,but the little box from Australia works perfect!!
    2012 RR TDV8 4.4
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  11. #29
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    Default Re: Automatic gearboxes and towing heavy loads

    Towing with an AUTO is really great.

    When you get to really heavy loads, just make sure that you do understand your gearbox operation.

    What makes an auto great is the seamless shifting, but this can also be its downfall.
    It is called slip or unlocking.
    The older generation used to install a lock-up kit to disable this function.

    Essentially the belts in the box slip when changing gear to make the transition smooth.
    Now under certain conditions, the belts does not engage fully and keep slipping.
    This friction can overheat the box,wear out the belts and destroy the oil.

    If the newer boxes also suffer from this, I do not know.
    That is why most manuals say select "SPORT" mode when towing, as it removes the slip function.

    Happy Towing!!!


    2007 Nissan Navara 4L Auto - Worshond


  12. #30
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by Wetkit View Post
    Towing with an AUTO is really great.

    When you get to really heavy loads, just make sure that you do understand your gearbox operation.

    What makes an auto great is the seamless shifting, but this can also be its downfall.
    It is called slip or unlocking.
    The older generation used to install a lock-up kit to disable this function.

    Essentially the belts in the box slip when changing gear to make the transition smooth.
    Now under certain conditions, the belts does not engage fully and keep slipping.
    This friction can overheat the box,wear out the belts and destroy the oil.

    If the newer boxes also suffer from this, I do not know.
    That is why most manuals say select "SPORT" mode when towing, as it removes the slip function.

    Happy Towing!!!
    Belts?
    "Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity" - Martin Luther king Jr

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  14. #31
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by Wetkit View Post
    Towing with an AUTO is really great.

    When you get to really heavy loads, just make sure that you do understand your gearbox operation.

    What makes an auto great is the seamless shifting, but this can also be its downfall.
    It is called slip or unlocking.
    The older generation used to install a lock-up kit to disable this function.

    Essentially the belts in the box slip when changing gear to make the transition smooth.
    Now under certain conditions, the belts does not engage fully and keep slipping.
    This friction can overheat the box,wear out the belts and destroy the oil.

    If the newer boxes also suffer from this, I do not know.
    That is why most manuals say select "SPORT" mode when towing, as it removes the slip function.

    Happy Towing!!!
    nope, pretty much everything you describe about the working of an automatic gearbox is wrong
    Anton Muller

    "That which can be asserted without evidence, can be dismissed without evidence." Christopher Hitchens.

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  16. #32
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    Default Automatic gearboxes and towing heavy loads

    I have been towing my Jurgens Classique for the past few years with my Ranger 3.2. When I hook the caravan, I shift it in S mode until i unhook the caravan again. I found that the gearbox shifts perfectly up or down, as conditions dictates and I only manually shifted it once or twice when going down steep mountain passes, to assist with engine braking. Once at the bottom of the pass, I shift back into S mode.
    Mine: 2018 Ford Ranger 3.2 4x4 A/T Wildtrak (Stock standard)
    Swambo: 2016 Jeep Grand Cherokee WK2 5.7 Overland (Stock standard)

  17. #33
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    Cool Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by 4ePajero View Post
    Belts?
    Every one on the internet is an expert.
    2011 Range Rover Vogue SE 4.4 TDV8
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  18. #34
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by williepvjr View Post
    Every one on the internet is an expert.
    Priceless…

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  19. #35
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by 4ePajero View Post
    Belts?
    Sorry, I think the correct terminology should be clutch packs?
    Not sure why I used the word "belts". Perhaps a blond moment...


    2007 Nissan Navara 4L Auto - Worshond


  20. #36
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by mullerza View Post
    nope, pretty much everything you describe about the working of an automatic gearbox is wrong
    I have no problem being told that I am wrong, but please then help me be correct.
    It is extremely easy to criticize, but then please also add value, if you brave enough.


    2007 Nissan Navara 4L Auto - Worshond


  21. #37
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    Default Re: Automatic gearboxes and towing heavy loads

    Quote Originally Posted by Wetkit View Post
    I have no problem being told that I am wrong, but please then help me be correct.
    It is extremely easy to criticize, but then please also add value, if you brave enough.
    I could have been nasty and made fun of your explanation of an autobox when there are plenty of resource a quick google away to explain to you how modern auto boxes work with very nice diagrams and videos. Also a lot of it was already explained in this thread.

    There are no belts in a autobox, you have a torque converter that allows for slip and lockup clutches that locks the torque converter in place. Modern boxes allow very little slip before the clutches engage to lock the torque converter - this is done mainly for fuel economy and is the reason why a modern automatic is on par a manual in fuel economy whilst still giving the smooth gear changes of an old school autobox

    The gearbox will only allow slip on pullaway and with gear changes, all other times the torque converter is locked. Sport function does not remove the slipping of the torque converter otherwise you probably break the box with the first gear change and it would be impossible to pull away Sport mode only changes the speeds and RPM at which the changes are made.
    Last edited by mullerza; 2021/09/28 at 09:26 AM.
    Anton Muller

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  23. #38
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    Default Re: Automatic gearboxes and towing heavy loads

    There is a discussion on the toyota thread where Brian is towing a 2.7T ski boat. I was asking about oil coolers as these used to be considered essential for any auto towing.

    He said that he changed the gearbox fluid on his fortuner at 70k and it was vuil! He is now changing every 40k. I think it depends a lot on what you are towing and how you drive, but he said he is taking it pretty easy with the boat.

    There does not seem to be anyone locally doing GB coolers, however that Aussie Guy that does the auto conversions on 4wd/24/7 channel does offer a kit for 8th gen hi luxes/fortuners.

    Perhaps something to consider?

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