AMT vs. Fluid drive autos

Fried clutch? On the uphill pull.

Fried brakes? Down the other side.

And they do smell different.

 

The DT12 auto will not up shift on a decent with engine brake mode engaged, no matter if in cruise, hill decent mode, or otherwise. It will warn you of over-rpm situation and make the driver correct the situation by braking to a slower speed or manually forcing an up shift. Not sure where you’re getting your information from.

 

It won’t put itself into an over rev state with a downshift. I will only allow a downshift if the resultant rpm won’t exceed 90% of the software limit of the engine. The driver probably just freaked out about the 21-2200 rpm but this is okay as long as it doesn’t go much higher.

The operation was by design given the driver braked to a slower speed when it also detected a down grade and engine braking was on. It assumed the driver was still wanting maximum engine braking output.

On snow and ice, I won’t exceed stage 2. Stage 3 is where it (DT12 and Detroit engine) becomes very aggressive with downshifts if rpm drops to a given downshift target

 

I'm in a 2017 Cascadia with the DD15/DT12 combo.
I have no problem backing. I can creep very slowly up to the dock, and touch it with the slightest bump.

I think that people that have SO much trouble backing with that setup simply have no restraint with their foot on the pedal.

 

Drives need to learn how the new DT12 works to run to get the most out of it.

The Detroit transmission has a special downhill mode that basically locks it into a speed you set it for. Plus letting the transmission downshift and bring the RPMs up to 2200 for maximum engine braking.

A lots of drivers got into bad habit of using engine brake in snow and claim the transmission is unsafe because it downshifting gears. In reality they are not using it correctly and the engine brake. I can go down most hills on just the engine brake and 2200 RPMs. That's how it setup to run if you want maximum braking power.

 

This thread and some of the comments in it remind me of this scene from the Clint Eastwood movie Heartbreak Ridge. Private does NOT know how to operate that rifle properly and blames the result ON THE rifle. The Gunny whom IS a Professional that knows and understands how to shoot demonstrated "there was nothing wrong with that rifle"

This scene does contain some salty language. Because of this I am covering it up with a spoiler.

Spoiler

 

I dont know how you would keep transmission fluid cool enough under load, thus the "fake" automatics that run with oil. After reading this thread though I guess they can.

 

Even car automatic transmissions have to have a cooler. It is possible to cool one. However I keep thinking about all those extra parts. More parts = more breakdowns.