Trans shifting while loaded

[Celtic Clamper]

The line out of the transmission to the cooler gives you true transmission temp and reacts instantly.

The line after the cooler will tell you what the cooler lowered it to. If this is what you’re watching, you have to try to figure out what it was before it went into the cooler.

Pan temp is going to be lower than the line temp and will react much slower. If all you’re watching is pan temp, it could be burnt up before your gauge tells you it’s too hot.

This makes sense. I will relocate the sensor. I am still mystified as to why my trans could be getting so hot, yet running and shifting so well.

 

[BigPapa]

What truck do you have?

 

[Celtic Clamper]

2002 2500 4x4 QCLB with 3.55's

 

[Ozymandias]

With a [slide in] camper and a trailer I'm around 13,000#. There's a lot of mountains in BC so I'm always picking the gear. On steeper roads I keep the RPM in the 2,500 - 3,000 range and I do end up in first from time to time. The TC will only lockup in 4th or 3rd with the OD off.

That are numbers that I do with a gasser.
A Turbo Diesel pulls with torque, not rpm.
Between 1800 and 2300 is my sweet spot, I only go above this number if there is no gear available that fits this.

 

[Road Dog]

True about the engine but its the slipping TC and the heat it generates that I worry about. I failed to mention I have 3.55 gears which is fine when empty but not so good when loaded.