Answers: The kickdown rod stuck down is only one of the possible cause. Could also be a modulator vacuum hose leak if it have a C6. If it has the C6 or AOD trans, it also could be the governor that is to say stuck. Worst case, hold a internal failure that will be expensive to fix. If the truck have a C6 trans, put it manual 1, later shift to 2nd at about 15 mph. If it shifts to 2nd, next it is modulator, governor or kickdown. M2 over-rides those inputs. If it does not shift to 2nd, then it is the intermediate tie or servo problem. On the AOD, the rod is for pressure control, not just kickdown. If it is stuck, shifts will bee extremely belatedly, if they happen at adjectives. If you don't have the tools or experience, suggest going to a upright trans mechanic.
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