Ly6/6l90e?

[clinebarger]

Originally Posted by slotard

Good to know. Does that prevent lockup, or just prevent top gear, or what?

And it isn't something I'll be doing very often, but I don't want to blow a tranny when I do.

Some info....

"Tow/haul mode is a function within the vehicle's software/calibration that optimizes transmission gear selection for operation during towing or with heavy loads. This optimization includes improving acceleration performance during launches, reducing shift busyness, assisting brake performance and speed control during engine braking situations, and improving vehicle speed control while requiring less throttle pedal activity.

In general, tow/haul mode maintains lower gears longer and increases shift pressures. It is designed to be most effective when the vehicle and trailer combined weight is at least 75% of the vehicle's Gross Combined Weight Rating (GCWR)"