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Would a bad catalytic converter cause shifting problems in a 2011 Dodge Caravan?

if the catalytic converters are bad will make the transmission shift erratic at times. due to the error codes going into the computer

No, it won’t.

If the converter is cutting your power, you will be using latget throttle poenings in attempt to maintain your usual acceleration and that can cause the transmission to downshift at lower speed than usual.