Sonnax highlights its line of heavy-duty input shafts for GM 4L transmissions. The company touts the torsional design that allows energy to be absorbed, reducing peak loads to critical areas.
Transmissions these shafts fit include the 4L60-E, 4L65-E and 4L70-E lines. Sonnax offers part no. 74678L-HD for 2WD and Corvette applications; and part no. 74678S-HD for 4WD/AWD applications.