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Old 11-11-2017, 09:35 PM
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Default Transmission Doing Strange Things

So Ive read a lot on the forum and it seems I may have a tranny that could be in the early stages of failure, but I'm not really sure.

since I have owned it when it would move from 2nd to 3rd it almost seemd to hold a higher rev for a few seconds then it would settle to a lower speed as you would expect when it shifts to a higher gear.

There was no slipping as you get when a transmission is wearing, it is was a very constant effect.

What I have noticed in the past week or so is that the tranny only drops a few revs when it shifts up to a higher gear and its not just 3rd any more. Again it does not appear to be slipping, more a case of the revs are not dropping. If I hold a gentle throttle the tranny does then settle down to a lower speed. If I am a little more hard on the throttle, it does not do this, which I why I say it does not seem to be slipping, just not dropping revs when moving to a higher gear, but only if I am gentle on the throttle.

Could this have anything to do with the adaptions - still reading up on how these work. If it 'learns' your driving style I tend to use the manual mode a lot and move to a higher gear as soon as possible. It keeps my fuel costs down a little. Can't complain as I get 12.4lt/100km - my previous 4.7 Grand Cherokee struggled to do better than 14.5!!

Its got around 180000km. Don't know if the oil has been previously changed, but I'm assuming it has as the diff oils were very clear when I changed then earlier this year, just after I got the truck.

I will do a full assessment tomorrow of when this happens, but I'm pretty sure it does it in auto, sport and manual, but only if I am gentle on the throttle.

It never shifts into first unless I'm starting on a hill or I have a lot of weight in the truck, which I'm assuming is due to the truck not needing such a low gear as 1st for normal driving with just me in it.

I'll have a look underneath tomorrow for any leaks as well.

Last edited by spannermonkey; 11-11-2017 at 10:08 PM.
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Old 11-13-2017, 01:12 PM
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I'd suggest clearing the adaptations and seeing if that helps...
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Old 11-13-2017, 03:23 PM
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How do you know it is shifting if the revs are not dropping? Or do you mean in manual mode and you try to shift, the number changes in the instrument cluster but it takes a second for the revs to drop? (that's pretty normal by the way, it's not a DSG or performance oriented transmission)
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Old 02-13-2018, 08:12 AM
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Well order placed for a GAP tool today. I've also got a new transmission pan and filter on its way and picked up 10ltrs of fluid (a recommended one and I crossed referenced the specs just to make sure) to do a fluid change as well as re-setting the adaptions all at the same time.

The issue is now I see no drop in rpm when in auto between 2nd 3rd and 4th. 3rd still seems to do some strange thing where it holds the rpm for a few seconds then drops down in rpm, but if I use a lot of gas it does not do it, same if I am in auto, sport or command mode. The transmission also never selects 1st, not sure if this is usual, but it seems to cope very well, no bogging down at any point. In fact I don't recall 1st ever being selected by the auto ever??????????. Again, in command mode it works fine.

If it is something more serious and the tranny is on its way out, I've not got much to loose by doing the flush and reset. Don't like the idea of needing a new one though$$$$$$$$$$$$$.

I will try to do a video to show this 'fault' in action.
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Old 02-13-2018, 09:36 AM
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The behavior in 3rd is completely normal (if I'm interpreting it right). For example, accelerating steadily, it'll shift to 3rd and then engine revs will dip slightly (200-300rpm) a couple seconds after (even with steady accelerator input) and then recover. This was explained somewhere else as the torque converter locking up.

Still not sure what you mean about no drop in RMP between 2nd, 3rd, 4th. The RPM should drop when it shifts the the next gear.
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Old 02-13-2018, 11:49 AM
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How do you know that the tranny never selects 1st gear?

I don't doubt it, I have a theory that the software solution to the CA stop is one that makes the tranny want to always stay in 2nd or higher. Often when I manually select 1st gear it will pop right back into 2 depending on the RPMs. If there are enough RPMs it will hold 1st otherwise, say around 2000, it will pop back into 2. This only started happening after the software patch.

As for the behavior while driving you describe....are you sure you're not over-thinking it? The LR3 does what it wants. I convinced myself of that a long time ago.
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Old 02-14-2018, 06:15 AM
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Thanks guys and I don't doubt the tranny does some strange things if it's own accord, so it's good to read about the lock up of the torque converter, That seems to make sense, but strange it only happens in 3rd.

As for the rom not dropping. That's exactly what happens. When in auto as it changes up the gears there is very little if any drop in rpm as each new gear selects. It's really hard to explain - so I will try to video tonight on way home.

As for selecting first. I am really familiar with the rpm band for each gear and know at which rpm you can move to the next and when it will automatically drop a gear when the rpm drop. I am fully confident it hardly ever drops to 1st.

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Old 02-14-2018, 11:02 AM
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I could be wrong but I believe that in normal all wheel drive configuration (on road selection) that it defaults to 2nd to start off from a stop. Only when you select other offroad programs does it utilize 1st gear for lower end torque.
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Old 02-14-2018, 02:11 PM
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I believe that is only Grass/Gravel/Snow that it defaults to a 2nd gear start. If you are completely stopped, it should use 1st unless, like Houm, you have the software upgrade for the California stop condition.
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Old 02-19-2018, 07:48 PM
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Thanx for the clarification DJ
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