i do not know for sure, but i dought that this style of trans comes with a larger dia shaft, i bought this trans from john rank , he used it in his modified he went to a 4 or 5 speed i know that everything was coated incl the gears. the first time that i have an issue with this trans i will put a lenco or owens most likely an owens ,lets see if it will pull a gear under a load ,also we can always make a larger dia shaft we will see thanks anthony