Driveline bump in new 2.8 auto

[OzDriver Member Find all posts View Profile Close OzDriver]

I am noticing a larger jolt when doing a 'manual' change on the 2.8 auto box from 4 to 3 on a low throttle or zero throttle. This does not happen when in fully auto mode. My dealer checked it and did not think there was a major problem (they offered me a drive in a demo car to compare... but I did not have time). I will give it some more running in time and might try another Prado to compare if it does not go away. Has anyone else noticed this?

[Lski Member Find all posts View Profile Close Lski]

I am noticing a larger jolt when doing a 'manual' change on the 2.8 auto box from 4 to 3 on a low throttle or zero throttle. This does not happen when in fully auto mode. My dealer checked it and did not think there was a major problem (they offered me a drive in a demo car to compare... but I did not have time). I will give it some more running in time and might try another Prado to compare if it does not go away. Has anyone else noticed this?

I haven't noticed this one... just went out to grab lunch and tried up/down shifting between 3/4 a few times - seemed fine.

[OzDriver Member Find all posts View Profile Close OzDriver]

Thanks Lski for the feedback. I will monitor it for a few weeks and unless it goes away I will test drive a demo car and see how it compares. The up-shift seems OK but down is not so smooth.

[Coo-ee Lurker Find all posts View Profile Close Coo-ee]

Hi All

I own a 2014 GXL Diesel Auto (15K on the clock) and have some strange gear changing habits that I am sure are not good for the car, thumps and bumps felt through the chassis (not audible). I picked out a few excerpts of the posts in this thread as they are all the same/similar things I am experiencing.

Lski - accelerating then removing foot off the accelerator (assume in 3rd to 5th gears), it almost feels like it changes gear when foot is removed from the accelerator and gives a little ‘bump’.

Lordsword - Never does it when stopped, so different from tailshaft clunk thread. When in 3rd, 4th or 5th and foot removed from accelerating, there it is, sometimes...

digys - I have a 6 week old 2.8 auto that does this sometimes. It only happens under acceleration form 1 to 2 or 2 to 3 if i suddenly let go of the accelarator just before it gets a chance to change cogs.

Ozdriver - I am noticing a larger jolt when doing a 'manual' change on the 2.8 auto box from 4 to 3 on a low throttle or zero throttle.

The continuity in the threads seems to be conditions under low to no throttle situations i.e. when the drive-train is lightly loaded. I find it most noticeable when in traffic and start/stopping or moving slowly with the traffic while accelerating and backing off the throttle. (Occurs - often).

Also does the following:

1) When under medium throttle, keeping up with traffic moving away from you, kicks down to 2nd from 3rd with a bump and sometimes a hard thump. (Occurs - often).

2) When you are on light throttle at 60 km/hr, the gearbox 'hangs' on to 4th, like it does not want to change up, and then "releases" into 5th gear. It does that with quite a thump. (Occurs - occasional).

3) When on light/medium throttle, the car has a mild lurch into 2nd and 3rd gears, like a manual gearbox where the clutch is released by dropping your foot off the clutch. Does not flare (no rev rise), just a forward lurch. (Occurs - occasional)

If you pull off from the lights and give it some throttle, no issues, smoothly up through the gears.

The concern I have is with the bumps and thumps, this can't be good for the gearbox, splined shafts, transfer case etc.

I have taken the car to Toyota who reset the gearbox learning programme, greased the tailshaft and told me everything is OK and quite normal for this vehicle.

After the tail shaft greasing things improved but 1000 k's later we are back to square one. I will be chasing them again tomorrow after leaving 2 messages for the service rep with no reply over the last week.

[Wardie Lurker Find all posts View Profile Close Wardie]

I to had this slight backlash when lifting of the gas on my new 2016my 2.8 prado .Greased the tail shaft slip joint and problem solved took me 2 minutes with a grease gun .

[Brendonj Lurker Find all posts View Profile Close Brendonj]

I have a new 2.8lt auto gxl. The week after I bought it there was a driveline bump most pronounced slowing down just below 40kmph so I think 4th to 3rd. There was another at slower speeds but less pronounced. I took it in and they checked the tail shaft and greased and gave it back saying to come back if there was still a prob. I drove it ou of the dealer and it was still here. I turns around and took it back. Next day they tried a new tail shaft and t did not work. They did some testing and the end result was a near gear box and torque converter need warranty (all at <1000km). I was 100% happy with the service although obviously a little upse by the shoe deal. Cheers

[cuda Advanced Member Find all posts View Profile Close cuda]

I have a new 2.8lt auto gxl. The week after I bought it there was a driveline bump most pronounced slowing down just below 40kmph so I think 4th to 3rd. There was another at slower speeds but less pronounced. I took it in and they checked the tail shaft and greased and gave it back saying to come back if there was still a prob. I drove it ou of the dealer and it was still here. I turns around and took it back. Next day they tried a new tail shaft and t did not work. They did some testing and the end result was a near gear box and torque converter need warranty (all at <1000km). I was 100% happy with the service although obviously a little upse by the shoe deal. Cheers

Interesting to see if it stays away for you now. I noticed a similar issue with mine which is annoying. Was going to comment at next service about it.

Thanks
Doug

[Lski Member Find all posts View Profile Close Lski]

My driveline clunk seems to have reduced dramatically. I'm at 8000km now and from about 4000km it started to reduce, however this was around the same time I had my suspension lift installed so it may have been as a result of the slight change in geometry.. Either way it doesn't really bother me now.

[Usernamewill Junior Member Find all posts View Profile Close Usernamewill]

My driveline clunk seems to have reduced dramatically. I'm at 8000km now and from about 4000km it started to reduce, however this was around the same time I had my suspension lift installed so it may have been as a result of the slight change in geometry.. Either way it doesn't really bother me now.

I'm hovering around the 5000km mark in my 2016 2.8, and I got suspension lift done about 2000km ago. Previous to the suspension, I got really noticeable clunks when driving low speed in car parks and lifting off the gas just as the car was going to change gear. Hopefully mine is like yours, I will have to test in some scenarios as mentioned above!

Otherwise, what are people's opinions/experiences on whether toyota will try and wash hands of it and blame the suspension?

Cheers, Will.

[5logs Junior Member Find all posts View Profile Close 5logs]

My 2016 clunk is different to what's been noted here, everytime you put it in reverse there is a quite pronounced thunk or clunk from the driveline, does it everytime. 2 inch lift, Automatic.

Also get a gap or a slow shift between 2nd and third when driving on a light throttle, it sort of hesitates to change and has a moment of slippage. Got quite a list of woes for the 10k service..

[Sarco Junior Member Find all posts View Profile Close Sarco]

I have a 6 week old 2.8 auto that does this sometimes. It only happens under acceleration form 1 to 2 or 2 to 3 if i suddenly let go of the accelarator just before it gets a chance to change cogs.

I also have a 6 weeks old 2.8 auto and it does exactly the same thing. Was a bit perturbed but I see it appears to be a common occurance.

[Brendonj Lurker Find all posts View Profile Close Brendonj]

I have put another 2500km on my Prado after the new gear box and torque converter and it is all good. Happy with the dealer service, and have just been contacted again by them to check in.

[iDestiny Junior Member Find all posts View Profile Close iDestiny]

I have put another 2500km on my Prado after the new gear box and torque converter and it is all good. Happy with the dealer service, and have just been contacted again by them to check in.

I assume not everyone will be offered a new gear box and torque converter for this problem?

I love the vehicle, hate bump (occasional) and the gear hanging/sticking (wihtout changing from 4》5 or 5》6) until i take my foot off the throttle or put my foot down further (this happens too regularly for my liking). The fact that it does this in relatively flat surfaces is also annoying. Mine is also the new 2.8l model.

[brogers Advanced Member Find all posts View Profile Close brogers]

I also have a 6 weeks old 2.8 auto and it does exactly the same thing. Was a bit perturbed but I see it appears to be a common occurance.

I have a 2016 GX Auto 2.8 Diesel and have not had a problem with thumps or clunks or gear change hesitations...touch wood!
If you have a problem with your new 2.8 GX or GXL diesel auto, and you would like to have a drive of my Prado so you can compare it to yours if you think you have a problem please let me know, thats if you are around Brisbane or the Sunshine Coast

[iDestiny Junior Member Find all posts View Profile Close iDestiny]

I have a 2016 GX Auto 2.8 Diesel and have not had a problem with thumps or clunks or gear change hesitations...touch wood!
If you have a problem with your new 2.8 GX or GXL diesel auto, and you would like to have a drive of my Prado so you can compare it to yours if you think you have a problem please let me know, thats if you are around Brisbane or the Sunshine Coast

No hesitations on gear change? Wow... perhaps i should post video sometime... i have to sometimes floor it or totally lay off for 4 to 5 or 5 to 6. Sometimes it sticks for 10+ seconds if i do nothing...