The Chevrolet Performance 4L70-E SuperMatic 2WD Four-Speed Automatic Transmission is an electronically controlled four speed overdrive transmission that comes factory fresh and is GM engineered, tested and validated to deliver smooth, dependable performance. Best of all Chevrolet Performance's full selection of controllers, adapter kits, and spacers make installation simple. This is the perfect companion for a new Chevrolet Performance crate engine. Everything you need for a solid and reliable powertrain.