We chose the six-speed automatic transmission Power Module. It uses the same 435hp Coyote engine as the manual transmission version with a different engine controller and wiring harness.

Dave installs the Allison transmission-control module in the engine compartment, next to the brake booster, and feeds its wiring harness down into the transmission tunnel.

Comparing features of the latest stand-alone automatic transmission control modules. Which one will work best for your transmission? Jeff Smith breaks it down.