Strength Considerations
Chrysler engineers decided that Hemis required a beefier input shaft so the standard 23-spline shaft was replaced with a beefier 18-spline unit and a larger input bearing was used to accept the additional torque. Later Chrysler decided that the high performance 440s needed this beefiness as well. It is one of a few aspects that set the "Hemi" four speeds apart from the standard 4.35" A-833s as being extra beefy. As far as strength is concerned, outside of the input shaft, the input bearing, the retainer and some special gear sets, there were no additional measures added to A-833s for Hemis. In the Sixties the only other difference between a Hemi A-833 and a Slant Six A-833 were the gear ratios used. The Slant Six 4-speed is just as beefy as the Street "Max Wedge" V-8 units.
