June 22, 2023
Not compatible with ’64–’66 TH400 main shafts with major diameter of spline about .980". To use the Sonnax hubs in these early units, a ’67-later main shaft with major diameter of spline about .970" must be used.
Sonnax heavy duty forward clutch hub 34322-01 is an ideal upgrade over OE hubs in GM TH400, TH425, 4L80-E and 4L85-E applications. It is made from 1045 steel forging and features a thicker cross-section for increased strength.