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A lot of people here on FTE like 5Star tuning, they can do custom tunes for your truck using a SCT tuner. There're also Edge, Jet, Bullydog and Banks to do what you want as well.
I did find this 5 year old thread about using a potentiometer with an uplifter switch and a resistor....pick the target ilde speed, select the indicated resistor and you have a selectable new default idle speed. i was looking for 800, closest on the chart is 900...so will use that one.