5.7 Liter Hemi, STS Single Turbocharger, ATF Billet Triple Disc Torque Converter and ATF 45RFE Transmission. ATF's transmission and torque converter allow the 5.7 Hemi engine to deliver 470 horsepower to the rear wheels reliably! The stock trans and converter just couldn't hold up. Automatic Transmission Factory: Make the shift, you'll be converted. [ Back ]