Featuring BorgWarner high-energy material, Sonnax clutch friction 104120-03 is grooved to disperse oil through the clutch pack for improved cooling. It is an ideal upgrade for the GM Powerglide high clutch and also for GM 6L80, 6L90 transmissions with an aftermarket, 45-tooth, 4-5-6 clutch hub. In 6L80/90 units only, these frictions must be used with wide aftermarket steels like Sonnax 104120-01 or 104120-02.