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Prado 2018 VXL Auto. 4000 km road and sand trip. Gearbox annoying behavior with temp data.

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  • Prado 2018 VXL Auto. 4000 km road and sand trip. Gearbox annoying behavior with temp data.

    Hello,

    My name is Fernando and I live in Spain.

    I have been round Morocco for the last week in a trip of over 3500 km most of them on the road, but there have been some on sand and dunes. My car is a Prado 2018 with as little as 4000 km on the clock (before this trip). Its a VXL one with 19 rims. I have been checking ATF temp with torque during the trip.

    I have notice (as I could read in the forum) that the torque converter tends to unlock all the time. I am afraid of the temperature that ATF can reach. On the highway (120-130 km/h) temperature is slightly above 90C. but when you have to climb gearbox reduces to 5th gear and will never lock up the torque converter. So ATF temp in the converter starts to raise. I have seen temps over 115C. The solution is to reduce to 4th gear. Then the converter will lock up.

    In the sand you have the same problem. Torque converter never locks up and you see ATF temperatures from 115 to 120 C. AT temp light didn't lit up at any time.

    Have some questions:

    Is the 90-95C a normal temperature in highway?

    Why the torque converter never locks-up in 5th gear?

    How is the better way of driving it? lock the 4th gear every time it reduces to 5th??

    Thanks in advance!

    PD. sorry if you see any mispellings in the thread.


    Last edited by ferktm; 17-05-2018, 07:03 AM. Reason: mispelling

  • #2
    Are you using s mode in the sand? Its better for your at temps.

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    • #3
      I've got similar temps on the highway from my transmission, I've decided to fit a cooler kit to reduce this temp as I want my box to last a good while.

      Comment


      • #4
        Originally posted by ferktm View Post
        Hello,

        My name is Fernando and I live in Spain.

        I have been round Morocco for the last week in a trip of over 3500 km most of them on the road, but there have been some on sand and dunes. My car is a Prado 2018 with as little as 4000 km on the clock (before this trip). Its a VXL one with 19 rims. I have been checking ATF temp with torque during the trip.

        I have notice (as I could read in the forum) that the torque converter tends to unlock all the time. I am afraid of the temperature that ATF can reach. On the highway (120-130 km/h) temperature is slightly above 90C. but when you have to climb gearbox reduces to 5th gear and will never lock up the torque converter. So ATF temp in the converter starts to raise. I have seen temps over 115C. The solution is to reduce to 4th gear. Then the converter will lock up.

        In the sand you have the same problem. Torque converter never locks up and you see ATF temperatures from 115 to 120 C. AT temp light didn't lit up at any time.

        Have some questions:

        Is the 90-95C a normal temperature in highway?

        Why the torque converter never locks-up in 5th gear?

        How is the better way of driving it? lock the 4th gear every time it reduces to 5th??

        Thanks in advance!

        PD. sorry if you see any mispellings in the topic.


        The reason why the transmission temp is so high is that its plumbed into the radiator for the engine which runs about 98 deg. Fitting a secondary cooler after the engine one will solve the issue. Dont see temps above 80 deg unless really stressing the AT.
        2016 2.8l 6spd Auto Prado Crystal Pearl VX, Dual Battery, Pro Racks, Towbar.

        Comment


        • #5
          I thought the 1GD ran at 83-85 degrees?
          Cheers
          Micheal.

          2008 GXL D4D Auto. GOING... GOING... GONE
          2015 GXL 1GD Auto. And it begins again...

          Comment


          • #6
            Originally posted by 120D4D View Post
            I thought the 1GD ran at 83-85 degrees?
            yes , that is what the engine temp sensor reports back to the ECU. However ive fitted an aftermarket digital temperature alarm to my engine and the display on that often climbs up to 95/98 and the scanguage still only shows 83/85 at most.

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            • #7
              After fitting my aftermarket cooler my trans. temps have been reduced by about 25-30 degrees- Haven't seen anything above 80 yet, seem to normally sit about 60 degrees when locked up on the highway (although it is winter here, QLD doesn't really get that cold where I live on the coast).

              Comment

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