Chevrolet Performance 19212657 - Programmable Transmission Controller

Works with 4L60-E, 4L65-E, 4L70-E, 4L80-E, 4L85-E Automatic Transmission. Complete control of programming the shift points under all throttle positions and the firmness of shifts. Recommended for engines with carburetors or where the EFI system operates in a stand alone controller and does not interface with the Transmission Controller.