The F23 is a five-speed manual transmission manufactured by Getrag in Italy. It is designed for transverse engine applications, primarily by General Motors. It can handle torque inputs of up to 230 newton metres (170 lbf·ft).
In the U.S. market, General Motors uses the F23 in two versions (with several application variations): the M86/M94 and MG3.
There is now an aftermarket source for limited slip differentials, of the helical-gear, torque-sensing / torque-biasing design.