The 2001 Dodge Ram Van doesn't have a traditional "transmission modulator" in the same way older vehicles did. The pressure control for the transmission is managed electronically by the Transmission Control Module (TCM). There's no external mechanical device to adjust.
Therefore, there's no single component you can point to and call a "modulator." The function is handled internally within the TCM and the valve body inside the transmission itself. Any adjustments or repairs would involve the TCM or a complete transmission overhaul.
