Heavy Duty 3 Speed Saginaw
My 72 C-10 was originally a 250 ci 6 with a 3 on the tree. Shortly after installing a 350 the original tranny gave up. The tranny shop happened to have a 3 speed available that they referred to as a heavy duty version. They installed it along with a nice Hurst 3 speed shift master shifter on the floor. I have had no issues with this tranny and until I can afford an automatic with overdrive I plan on using it with my new 383 with which be in to 375HP range with about 425 ft/lbs give or take. This heavy 3 speed has an casting provision for an extra bolt that is positioned on top of the casing. The bell housing from the old is not drilled or molded for this extra bolt but the tranyy shop said that the other four bolt holes will do as far as providing enough support. What is the deal with these "heavy duty" 3 speeds? are they OK to handle my new 383? At the time of installation they installed new bearings which they told me were heavier than the standard 3 speed. Just looking for extra info on this version I am running thanks.