Transmission Class Action??

[HammerTheWall]

The problem is the low speed, like 25-30 MPH or even less.
Offroad, forest roads, and not highways.
At 75MPH should be plenty of airflow and RPM to keep temperatures controlled.

I've been under 25-30mph for hours on trails going up and down the mountains, all off-road or forest roads. These trips usually last 3-4 hours, average probably twice a week or so. I'd venture a guess that the average speed during those times is 15-25 mph.

 

[DenisLM]

I've been under 25-30mph for hours on trails going up and down the mountains, all off-road or forest roads. These trips usually last 3-4 hours, average probably twice a week or so. I'd venture a guess that the average speed during those times is 15-25 mph.

Great!
Temperature on the dash always in the middle?

 

[jenos96]

The problem is the low speed, like 25-30 MPH or even less.
Offroad, forest roads, and not highways.
At 75MPH should be plenty of airflow and RPM to keep temperatures controlled.

For what it’s worth, I only got the overheat notification (not a dash light just a message) at around prolonged 3-5mph.

 

[Desertrider1]

My 1958 transmission started heating up yesterday when I got stuck behind a snowplow while going up the mountain to Brian Head, UT. It was a sustained climb at about 10-15mph for about 10-15 min. It was in D, and the temp started climbing to about 3/4, but luckily we got to the top before it got any worse. This is definitely not normal.

A post above said switching to 4L should fix the issue. Is it because in D the torque converter slips more than usual, causing excessive heat?

 

[cvx5832LC]

^ That's my guess, torque converter slip. Most 4x4s need to do this for pseudo-gearing, aka the slip essentially makes available an in-between gear. At the expense of heat, unfortunately. Getting it into 4LO gives you that lower gearing without the need for slip.

 

[p0rcupin3_tr33]

I do not have a lot of experience in this but my LC transmissions occasionally shifted gears rough during very low speed, usually happens when I slowly coasting to the traffic stop. I now try to put my break slightly harder instead of coasting and it seems to stop the rough shift. Not quite sure what happened there in the transmission.

I am experiencing something similar on mine as well.

Just like you, as I coast to a stop sign or red light, when downshifting there is a noticeable jerk. Applying the brakes early eliminates it like you alluded to, but I still don't want any jerk while downshifting.

Anyone else experiencing this.?

 

[KyLandcruiser]

Just put the vehicle in a lower gear. This should solve the problem. The vehicle is anticipating a gear change which slips the clutches and torque converter.

 

[Marinna]

Just put the vehicle in a lower gear. This should solve the problem. The vehicle is anticipating a gear change which slips the clutches and torque converter.

Do you mean switch to manual and shift to lowest gear?

 

[KyLandcruiser]

Do you mean switch to manual and shift to lowest gear?

Yes this is what I mean. This should solve the problem.

 

[p0rcupin3_tr33]

I mean changing to manual each time you come to a stop sign or red light seems a bit much imo.

Can this be fixed via a OTA updated from Toyota?

 

[KyLandcruiser]

I mean changing to manual each time you come to a stop sign or red light seems a bit much imo.

Can this be fixed via a OTA updated from Toyota?

Why would you do that? The transmission isn’t shifting at a stop light.

 

[HammerTheWall]

Great!
Temperature on the dash always in the middle?

Pretty much, might go up and down slightly but not much.