When he decided to install a 4L85-E he elected to go with an MSD transmission controller because the engine was equipped with an MSD Atomic fuel injection system.

Dez Racing installs and tests the MSD Launch Control unit in their '01 Ford Mustang GT. - Muscle Mustangs & Fast Fords Magazine ...

21. The 4L60E Street Smart transmission package comes with a stand-alone MSD Atomic transmission controller.

All electronically controlled Street Smart packages include a stand-alone transmission controller like an MSD Atomic trans controller or PCS unit.