This shifter is made up of three different shifters. It works really well and looks great . Lines up with the top plate and the prnd21. It is a three speed shifter but if the detent is replaced with one of a 4 speed it will all so work with a 4 speed. Uses the original 3 speed shifter cable in your 78-88 cutlass.                        G-body, Gbody, regal, Monte Carlo, Grand Prix, elcamino