Question for the Mad Dr.

[88Racing]

After further research and trial by error my ford f150 stays in second.
OD and 3 speed trannies have a built in feature that locks first and second gears together by the use of the torque bands. In manual tranny terms like starting out in second gear with feathering the clutch.
However on the way home in the gmc while from a dead stop put it in second and stayed in second. Did this again with trailer mode on and had a 1-2 shift. Retried same results. The gmc has the 5 speed auto. Does the trailor mode overide the torque bands electronically? All tests in lower gears in both vehicles produced sluggish trannies.