Let up on the gas pedal just a little just before the truck would shift out of OD. That tells the computer it's OK to go a little slower, and it won't shift.
The gas pedal is a "speed pedal" nowadays. The computer thinks that if you have it pressed a certain amount, that you want to go a certain speed, and will shift down to maintain that speed.
The gadget to program shift points is not cheap. For what it costs you can learn to put up with an occasional downshift.
Really, downshifting doesn't hurt anything. It doesn't use any more gas than lugging the engine down, in fact it uses less. It also puts less stress on both engine and transmission. The OD in those 4L60E transmissions is known to be weak.
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