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.